unofficial mirror of bug-gnu-emacs@gnu.org 
 help / color / mirror / code / Atom feed
blob bbdd2a9502c804afab4e049adf0071af68782c0d 245374 bytes (raw)
name: lisp/progmodes/python.el 	 # note: path name is non-authoritative(*)

   1
   2
   3
   4
   5
   6
   7
   8
   9
  10
  11
  12
  13
  14
  15
  16
  17
  18
  19
  20
  21
  22
  23
  24
  25
  26
  27
  28
  29
  30
  31
  32
  33
  34
  35
  36
  37
  38
  39
  40
  41
  42
  43
  44
  45
  46
  47
  48
  49
  50
  51
  52
  53
  54
  55
  56
  57
  58
  59
  60
  61
  62
  63
  64
  65
  66
  67
  68
  69
  70
  71
  72
  73
  74
  75
  76
  77
  78
  79
  80
  81
  82
  83
  84
  85
  86
  87
  88
  89
  90
  91
  92
  93
  94
  95
  96
  97
  98
  99
 100
 101
 102
 103
 104
 105
 106
 107
 108
 109
 110
 111
 112
 113
 114
 115
 116
 117
 118
 119
 120
 121
 122
 123
 124
 125
 126
 127
 128
 129
 130
 131
 132
 133
 134
 135
 136
 137
 138
 139
 140
 141
 142
 143
 144
 145
 146
 147
 148
 149
 150
 151
 152
 153
 154
 155
 156
 157
 158
 159
 160
 161
 162
 163
 164
 165
 166
 167
 168
 169
 170
 171
 172
 173
 174
 175
 176
 177
 178
 179
 180
 181
 182
 183
 184
 185
 186
 187
 188
 189
 190
 191
 192
 193
 194
 195
 196
 197
 198
 199
 200
 201
 202
 203
 204
 205
 206
 207
 208
 209
 210
 211
 212
 213
 214
 215
 216
 217
 218
 219
 220
 221
 222
 223
 224
 225
 226
 227
 228
 229
 230
 231
 232
 233
 234
 235
 236
 237
 238
 239
 240
 241
 242
 243
 244
 245
 246
 247
 248
 249
 250
 251
 252
 253
 254
 255
 256
 257
 258
 259
 260
 261
 262
 263
 264
 265
 266
 267
 268
 269
 270
 271
 272
 273
 274
 275
 276
 277
 278
 279
 280
 281
 282
 283
 284
 285
 286
 287
 288
 289
 290
 291
 292
 293
 294
 295
 296
 297
 298
 299
 300
 301
 302
 303
 304
 305
 306
 307
 308
 309
 310
 311
 312
 313
 314
 315
 316
 317
 318
 319
 320
 321
 322
 323
 324
 325
 326
 327
 328
 329
 330
 331
 332
 333
 334
 335
 336
 337
 338
 339
 340
 341
 342
 343
 344
 345
 346
 347
 348
 349
 350
 351
 352
 353
 354
 355
 356
 357
 358
 359
 360
 361
 362
 363
 364
 365
 366
 367
 368
 369
 370
 371
 372
 373
 374
 375
 376
 377
 378
 379
 380
 381
 382
 383
 384
 385
 386
 387
 388
 389
 390
 391
 392
 393
 394
 395
 396
 397
 398
 399
 400
 401
 402
 403
 404
 405
 406
 407
 408
 409
 410
 411
 412
 413
 414
 415
 416
 417
 418
 419
 420
 421
 422
 423
 424
 425
 426
 427
 428
 429
 430
 431
 432
 433
 434
 435
 436
 437
 438
 439
 440
 441
 442
 443
 444
 445
 446
 447
 448
 449
 450
 451
 452
 453
 454
 455
 456
 457
 458
 459
 460
 461
 462
 463
 464
 465
 466
 467
 468
 469
 470
 471
 472
 473
 474
 475
 476
 477
 478
 479
 480
 481
 482
 483
 484
 485
 486
 487
 488
 489
 490
 491
 492
 493
 494
 495
 496
 497
 498
 499
 500
 501
 502
 503
 504
 505
 506
 507
 508
 509
 510
 511
 512
 513
 514
 515
 516
 517
 518
 519
 520
 521
 522
 523
 524
 525
 526
 527
 528
 529
 530
 531
 532
 533
 534
 535
 536
 537
 538
 539
 540
 541
 542
 543
 544
 545
 546
 547
 548
 549
 550
 551
 552
 553
 554
 555
 556
 557
 558
 559
 560
 561
 562
 563
 564
 565
 566
 567
 568
 569
 570
 571
 572
 573
 574
 575
 576
 577
 578
 579
 580
 581
 582
 583
 584
 585
 586
 587
 588
 589
 590
 591
 592
 593
 594
 595
 596
 597
 598
 599
 600
 601
 602
 603
 604
 605
 606
 607
 608
 609
 610
 611
 612
 613
 614
 615
 616
 617
 618
 619
 620
 621
 622
 623
 624
 625
 626
 627
 628
 629
 630
 631
 632
 633
 634
 635
 636
 637
 638
 639
 640
 641
 642
 643
 644
 645
 646
 647
 648
 649
 650
 651
 652
 653
 654
 655
 656
 657
 658
 659
 660
 661
 662
 663
 664
 665
 666
 667
 668
 669
 670
 671
 672
 673
 674
 675
 676
 677
 678
 679
 680
 681
 682
 683
 684
 685
 686
 687
 688
 689
 690
 691
 692
 693
 694
 695
 696
 697
 698
 699
 700
 701
 702
 703
 704
 705
 706
 707
 708
 709
 710
 711
 712
 713
 714
 715
 716
 717
 718
 719
 720
 721
 722
 723
 724
 725
 726
 727
 728
 729
 730
 731
 732
 733
 734
 735
 736
 737
 738
 739
 740
 741
 742
 743
 744
 745
 746
 747
 748
 749
 750
 751
 752
 753
 754
 755
 756
 757
 758
 759
 760
 761
 762
 763
 764
 765
 766
 767
 768
 769
 770
 771
 772
 773
 774
 775
 776
 777
 778
 779
 780
 781
 782
 783
 784
 785
 786
 787
 788
 789
 790
 791
 792
 793
 794
 795
 796
 797
 798
 799
 800
 801
 802
 803
 804
 805
 806
 807
 808
 809
 810
 811
 812
 813
 814
 815
 816
 817
 818
 819
 820
 821
 822
 823
 824
 825
 826
 827
 828
 829
 830
 831
 832
 833
 834
 835
 836
 837
 838
 839
 840
 841
 842
 843
 844
 845
 846
 847
 848
 849
 850
 851
 852
 853
 854
 855
 856
 857
 858
 859
 860
 861
 862
 863
 864
 865
 866
 867
 868
 869
 870
 871
 872
 873
 874
 875
 876
 877
 878
 879
 880
 881
 882
 883
 884
 885
 886
 887
 888
 889
 890
 891
 892
 893
 894
 895
 896
 897
 898
 899
 900
 901
 902
 903
 904
 905
 906
 907
 908
 909
 910
 911
 912
 913
 914
 915
 916
 917
 918
 919
 920
 921
 922
 923
 924
 925
 926
 927
 928
 929
 930
 931
 932
 933
 934
 935
 936
 937
 938
 939
 940
 941
 942
 943
 944
 945
 946
 947
 948
 949
 950
 951
 952
 953
 954
 955
 956
 957
 958
 959
 960
 961
 962
 963
 964
 965
 966
 967
 968
 969
 970
 971
 972
 973
 974
 975
 976
 977
 978
 979
 980
 981
 982
 983
 984
 985
 986
 987
 988
 989
 990
 991
 992
 993
 994
 995
 996
 997
 998
 999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
3187
3188
3189
3190
3191
3192
3193
3194
3195
3196
3197
3198
3199
3200
3201
3202
3203
3204
3205
3206
3207
3208
3209
3210
3211
3212
3213
3214
3215
3216
3217
3218
3219
3220
3221
3222
3223
3224
3225
3226
3227
3228
3229
3230
3231
3232
3233
3234
3235
3236
3237
3238
3239
3240
3241
3242
3243
3244
3245
3246
3247
3248
3249
3250
3251
3252
3253
3254
3255
3256
3257
3258
3259
3260
3261
3262
3263
3264
3265
3266
3267
3268
3269
3270
3271
3272
3273
3274
3275
3276
3277
3278
3279
3280
3281
3282
3283
3284
3285
3286
3287
3288
3289
3290
3291
3292
3293
3294
3295
3296
3297
3298
3299
3300
3301
3302
3303
3304
3305
3306
3307
3308
3309
3310
3311
3312
3313
3314
3315
3316
3317
3318
3319
3320
3321
3322
3323
3324
3325
3326
3327
3328
3329
3330
3331
3332
3333
3334
3335
3336
3337
3338
3339
3340
3341
3342
3343
3344
3345
3346
3347
3348
3349
3350
3351
3352
3353
3354
3355
3356
3357
3358
3359
3360
3361
3362
3363
3364
3365
3366
3367
3368
3369
3370
3371
3372
3373
3374
3375
3376
3377
3378
3379
3380
3381
3382
3383
3384
3385
3386
3387
3388
3389
3390
3391
3392
3393
3394
3395
3396
3397
3398
3399
3400
3401
3402
3403
3404
3405
3406
3407
3408
3409
3410
3411
3412
3413
3414
3415
3416
3417
3418
3419
3420
3421
3422
3423
3424
3425
3426
3427
3428
3429
3430
3431
3432
3433
3434
3435
3436
3437
3438
3439
3440
3441
3442
3443
3444
3445
3446
3447
3448
3449
3450
3451
3452
3453
3454
3455
3456
3457
3458
3459
3460
3461
3462
3463
3464
3465
3466
3467
3468
3469
3470
3471
3472
3473
3474
3475
3476
3477
3478
3479
3480
3481
3482
3483
3484
3485
3486
3487
3488
3489
3490
3491
3492
3493
3494
3495
3496
3497
3498
3499
3500
3501
3502
3503
3504
3505
3506
3507
3508
3509
3510
3511
3512
3513
3514
3515
3516
3517
3518
3519
3520
3521
3522
3523
3524
3525
3526
3527
3528
3529
3530
3531
3532
3533
3534
3535
3536
3537
3538
3539
3540
3541
3542
3543
3544
3545
3546
3547
3548
3549
3550
3551
3552
3553
3554
3555
3556
3557
3558
3559
3560
3561
3562
3563
3564
3565
3566
3567
3568
3569
3570
3571
3572
3573
3574
3575
3576
3577
3578
3579
3580
3581
3582
3583
3584
3585
3586
3587
3588
3589
3590
3591
3592
3593
3594
3595
3596
3597
3598
3599
3600
3601
3602
3603
3604
3605
3606
3607
3608
3609
3610
3611
3612
3613
3614
3615
3616
3617
3618
3619
3620
3621
3622
3623
3624
3625
3626
3627
3628
3629
3630
3631
3632
3633
3634
3635
3636
3637
3638
3639
3640
3641
3642
3643
3644
3645
3646
3647
3648
3649
3650
3651
3652
3653
3654
3655
3656
3657
3658
3659
3660
3661
3662
3663
3664
3665
3666
3667
3668
3669
3670
3671
3672
3673
3674
3675
3676
3677
3678
3679
3680
3681
3682
3683
3684
3685
3686
3687
3688
3689
3690
3691
3692
3693
3694
3695
3696
3697
3698
3699
3700
3701
3702
3703
3704
3705
3706
3707
3708
3709
3710
3711
3712
3713
3714
3715
3716
3717
3718
3719
3720
3721
3722
3723
3724
3725
3726
3727
3728
3729
3730
3731
3732
3733
3734
3735
3736
3737
3738
3739
3740
3741
3742
3743
3744
3745
3746
3747
3748
3749
3750
3751
3752
3753
3754
3755
3756
3757
3758
3759
3760
3761
3762
3763
3764
3765
3766
3767
3768
3769
3770
3771
3772
3773
3774
3775
3776
3777
3778
3779
3780
3781
3782
3783
3784
3785
3786
3787
3788
3789
3790
3791
3792
3793
3794
3795
3796
3797
3798
3799
3800
3801
3802
3803
3804
3805
3806
3807
3808
3809
3810
3811
3812
3813
3814
3815
3816
3817
3818
3819
3820
3821
3822
3823
3824
3825
3826
3827
3828
3829
3830
3831
3832
3833
3834
3835
3836
3837
3838
3839
3840
3841
3842
3843
3844
3845
3846
3847
3848
3849
3850
3851
3852
3853
3854
3855
3856
3857
3858
3859
3860
3861
3862
3863
3864
3865
3866
3867
3868
3869
3870
3871
3872
3873
3874
3875
3876
3877
3878
3879
3880
3881
3882
3883
3884
3885
3886
3887
3888
3889
3890
3891
3892
3893
3894
3895
3896
3897
3898
3899
3900
3901
3902
3903
3904
3905
3906
3907
3908
3909
3910
3911
3912
3913
3914
3915
3916
3917
3918
3919
3920
3921
3922
3923
3924
3925
3926
3927
3928
3929
3930
3931
3932
3933
3934
3935
3936
3937
3938
3939
3940
3941
3942
3943
3944
3945
3946
3947
3948
3949
3950
3951
3952
3953
3954
3955
3956
3957
3958
3959
3960
3961
3962
3963
3964
3965
3966
3967
3968
3969
3970
3971
3972
3973
3974
3975
3976
3977
3978
3979
3980
3981
3982
3983
3984
3985
3986
3987
3988
3989
3990
3991
3992
3993
3994
3995
3996
3997
3998
3999
4000
4001
4002
4003
4004
4005
4006
4007
4008
4009
4010
4011
4012
4013
4014
4015
4016
4017
4018
4019
4020
4021
4022
4023
4024
4025
4026
4027
4028
4029
4030
4031
4032
4033
4034
4035
4036
4037
4038
4039
4040
4041
4042
4043
4044
4045
4046
4047
4048
4049
4050
4051
4052
4053
4054
4055
4056
4057
4058
4059
4060
4061
4062
4063
4064
4065
4066
4067
4068
4069
4070
4071
4072
4073
4074
4075
4076
4077
4078
4079
4080
4081
4082
4083
4084
4085
4086
4087
4088
4089
4090
4091
4092
4093
4094
4095
4096
4097
4098
4099
4100
4101
4102
4103
4104
4105
4106
4107
4108
4109
4110
4111
4112
4113
4114
4115
4116
4117
4118
4119
4120
4121
4122
4123
4124
4125
4126
4127
4128
4129
4130
4131
4132
4133
4134
4135
4136
4137
4138
4139
4140
4141
4142
4143
4144
4145
4146
4147
4148
4149
4150
4151
4152
4153
4154
4155
4156
4157
4158
4159
4160
4161
4162
4163
4164
4165
4166
4167
4168
4169
4170
4171
4172
4173
4174
4175
4176
4177
4178
4179
4180
4181
4182
4183
4184
4185
4186
4187
4188
4189
4190
4191
4192
4193
4194
4195
4196
4197
4198
4199
4200
4201
4202
4203
4204
4205
4206
4207
4208
4209
4210
4211
4212
4213
4214
4215
4216
4217
4218
4219
4220
4221
4222
4223
4224
4225
4226
4227
4228
4229
4230
4231
4232
4233
4234
4235
4236
4237
4238
4239
4240
4241
4242
4243
4244
4245
4246
4247
4248
4249
4250
4251
4252
4253
4254
4255
4256
4257
4258
4259
4260
4261
4262
4263
4264
4265
4266
4267
4268
4269
4270
4271
4272
4273
4274
4275
4276
4277
4278
4279
4280
4281
4282
4283
4284
4285
4286
4287
4288
4289
4290
4291
4292
4293
4294
4295
4296
4297
4298
4299
4300
4301
4302
4303
4304
4305
4306
4307
4308
4309
4310
4311
4312
4313
4314
4315
4316
4317
4318
4319
4320
4321
4322
4323
4324
4325
4326
4327
4328
4329
4330
4331
4332
4333
4334
4335
4336
4337
4338
4339
4340
4341
4342
4343
4344
4345
4346
4347
4348
4349
4350
4351
4352
4353
4354
4355
4356
4357
4358
4359
4360
4361
4362
4363
4364
4365
4366
4367
4368
4369
4370
4371
4372
4373
4374
4375
4376
4377
4378
4379
4380
4381
4382
4383
4384
4385
4386
4387
4388
4389
4390
4391
4392
4393
4394
4395
4396
4397
4398
4399
4400
4401
4402
4403
4404
4405
4406
4407
4408
4409
4410
4411
4412
4413
4414
4415
4416
4417
4418
4419
4420
4421
4422
4423
4424
4425
4426
4427
4428
4429
4430
4431
4432
4433
4434
4435
4436
4437
4438
4439
4440
4441
4442
4443
4444
4445
4446
4447
4448
4449
4450
4451
4452
4453
4454
4455
4456
4457
4458
4459
4460
4461
4462
4463
4464
4465
4466
4467
4468
4469
4470
4471
4472
4473
4474
4475
4476
4477
4478
4479
4480
4481
4482
4483
4484
4485
4486
4487
4488
4489
4490
4491
4492
4493
4494
4495
4496
4497
4498
4499
4500
4501
4502
4503
4504
4505
4506
4507
4508
4509
4510
4511
4512
4513
4514
4515
4516
4517
4518
4519
4520
4521
4522
4523
4524
4525
4526
4527
4528
4529
4530
4531
4532
4533
4534
4535
4536
4537
4538
4539
4540
4541
4542
4543
4544
4545
4546
4547
4548
4549
4550
4551
4552
4553
4554
4555
4556
4557
4558
4559
4560
4561
4562
4563
4564
4565
4566
4567
4568
4569
4570
4571
4572
4573
4574
4575
4576
4577
4578
4579
4580
4581
4582
4583
4584
4585
4586
4587
4588
4589
4590
4591
4592
4593
4594
4595
4596
4597
4598
4599
4600
4601
4602
4603
4604
4605
4606
4607
4608
4609
4610
4611
4612
4613
4614
4615
4616
4617
4618
4619
4620
4621
4622
4623
4624
4625
4626
4627
4628
4629
4630
4631
4632
4633
4634
4635
4636
4637
4638
4639
4640
4641
4642
4643
4644
4645
4646
4647
4648
4649
4650
4651
4652
4653
4654
4655
4656
4657
4658
4659
4660
4661
4662
4663
4664
4665
4666
4667
4668
4669
4670
4671
4672
4673
4674
4675
4676
4677
4678
4679
4680
4681
4682
4683
4684
4685
4686
4687
4688
4689
4690
4691
4692
4693
4694
4695
4696
4697
4698
4699
4700
4701
4702
4703
4704
4705
4706
4707
4708
4709
4710
4711
4712
4713
4714
4715
4716
4717
4718
4719
4720
4721
4722
4723
4724
4725
4726
4727
4728
4729
4730
4731
4732
4733
4734
4735
4736
4737
4738
4739
4740
4741
4742
4743
4744
4745
4746
4747
4748
4749
4750
4751
4752
4753
4754
4755
4756
4757
4758
4759
4760
4761
4762
4763
4764
4765
4766
4767
4768
4769
4770
4771
4772
4773
4774
4775
4776
4777
4778
4779
4780
4781
4782
4783
4784
4785
4786
4787
4788
4789
4790
4791
4792
4793
4794
4795
4796
4797
4798
4799
4800
4801
4802
4803
4804
4805
4806
4807
4808
4809
4810
4811
4812
4813
4814
4815
4816
4817
4818
4819
4820
4821
4822
4823
4824
4825
4826
4827
4828
4829
4830
4831
4832
4833
4834
4835
4836
4837
4838
4839
4840
4841
4842
4843
4844
4845
4846
4847
4848
4849
4850
4851
4852
4853
4854
4855
4856
4857
4858
4859
4860
4861
4862
4863
4864
4865
4866
4867
4868
4869
4870
4871
4872
4873
4874
4875
4876
4877
4878
4879
4880
4881
4882
4883
4884
4885
4886
4887
4888
4889
4890
4891
4892
4893
4894
4895
4896
4897
4898
4899
4900
4901
4902
4903
4904
4905
4906
4907
4908
4909
4910
4911
4912
4913
4914
4915
4916
4917
4918
4919
4920
4921
4922
4923
4924
4925
4926
4927
4928
4929
4930
4931
4932
4933
4934
4935
4936
4937
4938
4939
4940
4941
4942
4943
4944
4945
4946
4947
4948
4949
4950
4951
4952
4953
4954
4955
4956
4957
4958
4959
4960
4961
4962
4963
4964
4965
4966
4967
4968
4969
4970
4971
4972
4973
4974
4975
4976
4977
4978
4979
4980
4981
4982
4983
4984
4985
4986
4987
4988
4989
4990
4991
4992
4993
4994
4995
4996
4997
4998
4999
5000
5001
5002
5003
5004
5005
5006
5007
5008
5009
5010
5011
5012
5013
5014
5015
5016
5017
5018
5019
5020
5021
5022
5023
5024
5025
5026
5027
5028
5029
5030
5031
5032
5033
5034
5035
5036
5037
5038
5039
5040
5041
5042
5043
5044
5045
5046
5047
5048
5049
5050
5051
5052
5053
5054
5055
5056
5057
5058
5059
5060
5061
5062
5063
5064
5065
5066
5067
5068
5069
5070
5071
5072
5073
5074
5075
5076
5077
5078
5079
5080
5081
5082
5083
5084
5085
5086
5087
5088
5089
5090
5091
5092
5093
5094
5095
5096
5097
5098
5099
5100
5101
5102
5103
5104
5105
5106
5107
5108
5109
5110
5111
5112
5113
5114
5115
5116
5117
5118
5119
5120
5121
5122
5123
5124
5125
5126
5127
5128
5129
5130
5131
5132
5133
5134
5135
5136
5137
5138
5139
5140
5141
5142
5143
5144
5145
5146
5147
5148
5149
5150
5151
5152
5153
5154
5155
5156
5157
5158
5159
5160
5161
5162
5163
5164
5165
5166
5167
5168
5169
5170
5171
5172
5173
5174
5175
5176
5177
5178
5179
5180
5181
5182
5183
5184
5185
5186
5187
5188
5189
5190
5191
5192
5193
5194
5195
5196
5197
5198
5199
5200
5201
5202
5203
5204
5205
5206
5207
5208
5209
5210
5211
5212
5213
5214
5215
5216
5217
5218
5219
5220
5221
5222
5223
5224
5225
5226
5227
5228
5229
5230
5231
5232
5233
5234
5235
5236
5237
5238
5239
5240
5241
5242
5243
5244
5245
5246
5247
5248
5249
5250
5251
5252
5253
5254
5255
5256
5257
5258
5259
5260
5261
5262
5263
5264
5265
5266
5267
5268
5269
5270
5271
5272
5273
5274
5275
5276
5277
5278
5279
5280
5281
5282
5283
5284
5285
5286
5287
5288
5289
5290
5291
5292
5293
5294
5295
5296
5297
5298
5299
5300
5301
5302
5303
5304
5305
5306
5307
5308
5309
5310
5311
5312
5313
5314
5315
5316
5317
5318
5319
5320
5321
5322
5323
5324
5325
5326
5327
5328
5329
5330
5331
5332
5333
5334
5335
5336
5337
5338
5339
5340
5341
5342
5343
5344
5345
5346
5347
5348
5349
5350
5351
5352
5353
5354
5355
5356
5357
5358
5359
5360
5361
5362
5363
5364
5365
5366
5367
5368
5369
5370
5371
5372
5373
5374
5375
5376
5377
5378
5379
5380
5381
5382
5383
5384
5385
5386
5387
5388
5389
5390
5391
5392
5393
5394
5395
5396
5397
5398
5399
5400
5401
5402
5403
5404
5405
5406
5407
5408
5409
5410
5411
5412
5413
5414
5415
5416
5417
5418
5419
5420
5421
5422
5423
5424
5425
5426
5427
5428
5429
5430
5431
5432
5433
5434
5435
5436
5437
5438
5439
5440
5441
5442
5443
5444
5445
5446
5447
5448
5449
5450
5451
5452
5453
5454
5455
5456
5457
5458
5459
5460
5461
5462
5463
5464
5465
5466
5467
5468
5469
5470
5471
5472
5473
5474
5475
5476
5477
5478
5479
5480
5481
5482
5483
5484
5485
5486
5487
5488
5489
5490
5491
5492
5493
5494
5495
5496
5497
5498
5499
5500
5501
5502
5503
5504
5505
5506
5507
5508
5509
5510
5511
5512
5513
5514
5515
5516
5517
5518
5519
5520
5521
5522
5523
5524
5525
5526
5527
5528
5529
5530
5531
5532
5533
5534
5535
5536
5537
5538
5539
5540
5541
5542
5543
5544
5545
5546
5547
5548
5549
5550
5551
5552
5553
5554
5555
5556
5557
5558
5559
5560
5561
5562
5563
5564
5565
5566
5567
5568
5569
5570
5571
5572
5573
5574
5575
5576
5577
5578
5579
5580
5581
5582
5583
5584
5585
5586
5587
5588
5589
5590
5591
5592
5593
5594
5595
5596
5597
5598
5599
5600
5601
5602
5603
5604
5605
5606
5607
5608
5609
5610
5611
5612
5613
5614
5615
5616
5617
5618
5619
5620
5621
5622
5623
5624
5625
5626
5627
5628
5629
5630
5631
5632
5633
5634
5635
5636
5637
5638
5639
5640
5641
5642
5643
5644
5645
5646
5647
5648
5649
5650
5651
5652
5653
5654
5655
5656
5657
5658
5659
5660
5661
5662
5663
5664
5665
5666
5667
5668
5669
5670
5671
5672
5673
5674
5675
5676
5677
5678
5679
5680
5681
5682
5683
5684
5685
5686
5687
5688
5689
5690
5691
5692
5693
5694
5695
5696
5697
5698
5699
5700
5701
5702
5703
5704
5705
5706
5707
5708
5709
5710
5711
5712
5713
5714
5715
5716
5717
5718
5719
5720
5721
5722
5723
5724
5725
5726
5727
5728
5729
5730
5731
5732
5733
5734
5735
5736
5737
5738
5739
5740
5741
5742
5743
5744
5745
5746
5747
5748
5749
5750
5751
5752
5753
5754
5755
5756
5757
5758
5759
5760
5761
5762
5763
5764
5765
5766
5767
5768
5769
5770
5771
5772
5773
5774
5775
5776
5777
5778
5779
5780
5781
5782
5783
5784
5785
5786
5787
5788
5789
5790
5791
5792
5793
5794
5795
5796
5797
5798
5799
5800
5801
5802
5803
5804
5805
5806
5807
5808
5809
5810
5811
5812
5813
5814
5815
5816
5817
5818
5819
5820
5821
5822
5823
5824
5825
5826
5827
5828
5829
5830
5831
5832
5833
5834
5835
5836
5837
5838
5839
5840
5841
 
;;; python.el --- Python's flying circus support for Emacs -*- lexical-binding: t -*-

;; Copyright (C) 2003-2022 Free Software Foundation, Inc.

;; Author: Fabián E. Gallina <fgallina@gnu.org>
;; URL: https://github.com/fgallina/python.el
;; Version: 0.28
;; Package-Requires: ((emacs "24.4") (cl-lib "1.0") (seq "2.23"))
;; Maintainer: emacs-devel@gnu.org
;; Created: Jul 2010
;; Keywords: languages

;; This file is part of GNU Emacs.

;; GNU Emacs is free software: you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published
;; by the Free Software Foundation, either version 3 of the License,
;; or (at your option) any later version.

;; GNU Emacs is distributed in the hope that it will be useful, but
;; WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
;; General Public License for more details.

;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs.  If not, see <https://www.gnu.org/licenses/>.

;;; Commentary:

;; Major mode for editing Python files with some fontification and
;; indentation bits extracted from original Dave Love's python.el
;; found in GNU Emacs.

;; Implements Syntax highlighting, Indentation, Movement, Shell
;; interaction, Shell completion, Shell virtualenv support, Shell
;; package support, Shell syntax highlighting, Pdb tracking, Symbol
;; completion, Skeletons, FFAP, Code Check, ElDoc, Imenu.

;; Syntax highlighting: Fontification of code is provided and supports
;; python's triple quoted strings properly.

;; Indentation: Automatic indentation with indentation cycling is
;; provided, it allows you to navigate different available levels of
;; indentation by hitting <tab> several times.  Also electric-indent-mode
;; is supported such that when inserting a colon the current line is
;; dedented automatically if needed.

;; Movement: `beginning-of-defun' and `end-of-defun' functions are
;; properly implemented.  There are also specialized
;; `forward-sentence' and `backward-sentence' replacements called
;; `python-nav-forward-block', `python-nav-backward-block'
;; respectively which navigate between beginning of blocks of code.
;; Extra functions `python-nav-forward-statement',
;; `python-nav-backward-statement',
;; `python-nav-beginning-of-statement', `python-nav-end-of-statement',
;; `python-nav-beginning-of-block', `python-nav-end-of-block' and
;; `python-nav-if-name-main' are included but no bound to any key.

;; Shell interaction: is provided and allows opening Python shells
;; inside Emacs and executing any block of code of your current buffer
;; in that inferior Python process.

;; Besides that only the standard CPython (2.x and 3.x) shell and
;; IPython are officially supported out of the box, the interaction
;; should support any other readline based Python shells as well
;; (e.g. Jython and PyPy have been reported to work).  You can change
;; your default interpreter and commandline arguments by setting the
;; `python-shell-interpreter' and `python-shell-interpreter-args'
;; variables.  This example enables IPython globally:

;; (setq python-shell-interpreter "ipython"
;;       python-shell-interpreter-args "-i")

;; Using the "console" subcommand to start IPython in server-client
;; mode is known to fail intermittently due a bug on IPython itself
;; (see URL `https://debbugs.gnu.org/cgi/bugreport.cgi?bug=18052#27').
;; There seems to be a race condition in the IPython server (A.K.A
;; kernel) when code is sent while it is still initializing, sometimes
;; causing the shell to get stalled.  With that said, if an IPython
;; kernel is already running, "console --existing" seems to work fine.

;; Running IPython on Windows needs more tweaking.  The way you should
;; set `python-shell-interpreter' and `python-shell-interpreter-args'
;; is as follows (of course you need to modify the paths according to
;; your system):

;; (setq python-shell-interpreter "C:/Python27/python.exe"
;;       python-shell-interpreter-args
;;       "-i C:/Python27/Scripts/ipython-script.py")

;; Missing or delayed output used to happen due to differences between
;; Operating Systems' pipe buffering (e.g. CPython 3.3.4 in Windows 7.
;; See URL `https://debbugs.gnu.org/cgi/bugreport.cgi?bug=17304').  To
;; avoid this, the `python-shell-unbuffered' defaults to non-nil and
;; controls whether `python-shell--calculate-process-environment'
;; should set the "PYTHONUNBUFFERED" environment variable on startup:
;; See URL `https://docs.python.org/3/using/cmdline.html#cmdoption-u'.

;; The interaction relies upon having prompts for input (e.g. ">>> "
;; and "... " in standard Python shell) and output (e.g. "Out[1]: " in
;; IPython) detected properly.  Failing that Emacs may hang but, in
;; the case that happens, you can recover with \\[keyboard-quit].  To
;; avoid this issue, a two-step prompt autodetection mechanism is
;; provided: the first step is manual and consists of a collection of
;; regular expressions matching common prompts for Python shells
;; stored in `python-shell-prompt-input-regexps' and
;; `python-shell-prompt-output-regexps', and dir-local friendly vars
;; `python-shell-prompt-regexp', `python-shell-prompt-block-regexp',
;; `python-shell-prompt-output-regexp' which are appended to the
;; former automatically when a shell spawns; the second step is
;; automatic and depends on the `python-shell-prompt-detect' helper
;; function.  See its docstring for details on global variables that
;; modify its behavior.

;; Shell completion: hitting tab will try to complete the current
;; word.  The two built-in mechanisms depend on Python's readline
;; module: the "native" completion is tried first and is activated
;; when `python-shell-completion-native-enable' is non-nil, the
;; current `python-shell-interpreter' is not a member of the
;; `python-shell-completion-native-disabled-interpreters' variable and
;; `python-shell-completion-native-setup' succeeds; the "fallback" or
;; "legacy" mechanism works by executing Python code in the background
;; and enables auto-completion for shells that do not support
;; receiving escape sequences (with some limitations, i.e. completion
;; in blocks does not work).  The code executed for the "fallback"
;; completion can be found in `python-shell-completion-setup-code' and
;; `python-shell-completion-string-code' variables.  Their default
;; values enable completion for both CPython and IPython, and probably
;; any readline based shell (it's known to work with PyPy).  If your
;; Python installation lacks readline (like CPython for Windows),
;; installing pyreadline (URL `https://ipython.org/pyreadline.html')
;; should suffice.  To troubleshoot why you are not getting any
;; completions, you can try the following in your Python shell:

;; >>> import readline, rlcompleter

;; If you see an error, then you need to either install pyreadline or
;; setup custom code that avoids that dependency.

;; Shell virtualenv support: The shell also contains support for
;; virtualenvs and other special environment modifications thanks to
;; `python-shell-process-environment' and `python-shell-exec-path'.
;; These two variables allows you to modify execution paths and
;; environment variables to make easy for you to setup virtualenv rules
;; or behavior modifications when running shells.  Here is an example
;; of how to make shell processes to be run using the /path/to/env/
;; virtualenv:

;; (setq python-shell-process-environment
;;       (list
;;        (format "PATH=%s" (mapconcat
;;                           #'identity
;;                           (reverse
;;                            (cons (getenv "PATH")
;;                                  '("/path/to/env/bin/")))
;;                           ":"))
;;        "VIRTUAL_ENV=/path/to/env/"))
;; (python-shell-exec-path . ("/path/to/env/bin/"))

;; Since the above is cumbersome and can be programmatically
;; calculated, the variable `python-shell-virtualenv-root' is
;; provided.  When this variable is set with the path of the
;; virtualenv to use, `process-environment' and `exec-path' get proper
;; values in order to run shells inside the specified virtualenv.  So
;; the following will achieve the same as the previous example:

;; (setq python-shell-virtualenv-root "/path/to/env/")

;; Also the `python-shell-extra-pythonpaths' variable have been
;; introduced as simple way of adding paths to the PYTHONPATH without
;; affecting existing values.

;; Shell package support: you can enable a package in the current
;; shell so that relative imports work properly using the
;; `python-shell-package-enable' command.

;; Shell remote support: remote Python shells are started with the
;; correct environment for files opened remotely through tramp, also
;; respecting dir-local variables provided `enable-remote-dir-locals'
;; is non-nil.  The logic for this is transparently handled by the
;; `python-shell-with-environment' macro.

;; Shell syntax highlighting: when enabled current input in shell is
;; highlighted.  The variable `python-shell-font-lock-enable' controls
;; activation of this feature globally when shells are started.
;; Activation/deactivation can be also controlled on the fly via the
;; `python-shell-font-lock-toggle' command.

;; Pdb tracking: when you execute a block of code that contains some
;; call to pdb (or ipdb) it will prompt the block of code and will
;; follow the execution of pdb marking the current line with an arrow.

;; Symbol completion: you can complete the symbol at point.  It uses
;; the shell completion in background so you should run
;; `python-shell-send-buffer' from time to time to get better results.

;; Skeletons: skeletons are provided for simple inserting of things like class,
;; def, for, import, if, try, and while.  These skeletons are
;; integrated with abbrev.  If you have `abbrev-mode' activated and
;; `python-skeleton-autoinsert' is set to t, then whenever you type
;; the name of any of those defined and hit SPC, they will be
;; automatically expanded.  As an alternative you can use the defined
;; skeleton commands: `python-skeleton-<foo>'.

;; FFAP: You can find the filename for a given module when using ffap
;; out of the box.  This feature needs an inferior python shell
;; running.

;; Code check: Check the current file for errors with `python-check'
;; using the program defined in `python-check-command'.

;; ElDoc: returns documentation for object at point by using the
;; inferior python subprocess to inspect its documentation.  As you
;; might guessed you should run `python-shell-send-buffer' from time
;; to time to get better results too.

;; Imenu: There are two index building functions to be used as
;; `imenu-create-index-function': `python-imenu-create-index' (the
;; default one, builds the alist in form of a tree) and
;; `python-imenu-create-flat-index'.  See also
;; `python-imenu-format-item-label-function',
;; `python-imenu-format-parent-item-label-function',
;; `python-imenu-format-parent-item-jump-label-function' variables for
;; changing the way labels are formatted in the tree version.

;; If you used python-mode.el you may miss auto-indentation when
;; inserting newlines.  To achieve the same behavior you have two
;; options:

;; 1) Enable the minor-mode `electric-indent-mode' (enabled by
;;    default) and use RET.  If this mode is disabled use
;;    `newline-and-indent', bound to C-j.

;; 2) Add the following hook in your .emacs:

;; (add-hook 'python-mode-hook
;;   (lambda ()
;;     (define-key python-mode-map "\C-m" 'newline-and-indent)))

;; I'd recommend the first one since you'll get the same behavior for
;; all modes out-of-the-box.

;;; Code:

(require 'ansi-color)
(require 'cl-lib)
(require 'comint)
(require 'project nil 'noerror)
(require 'seq)
(eval-when-compile (require 'subr-x))   ;For `string-empty-p'.

;; Avoid compiler warnings
(defvar compilation-error-regexp-alist)
(defvar outline-heading-end-regexp)

(autoload 'comint-mode "comint")
(autoload 'help-function-arglist "help-fns")

;;;###autoload
(add-to-list 'auto-mode-alist (cons (purecopy "\\.py[iw]?\\'") 'python-mode))
;;;###autoload
(add-to-list 'interpreter-mode-alist (cons (purecopy "python[0-9.]*") 'python-mode))

(defgroup python nil
  "Python Language's flying circus support for Emacs."
  :group 'languages
  :version "24.3"
  :link '(emacs-commentary-link "python"))


\f
;;; Bindings

(defvar python-mode-map
  (let ((map (make-sparse-keymap)))
    ;; Movement
    (define-key map [remap backward-sentence] #'python-nav-backward-block)
    (define-key map [remap forward-sentence] #'python-nav-forward-block)
    (define-key map [remap backward-up-list] #'python-nav-backward-up-list)
    (define-key map [remap mark-defun] #'python-mark-defun)
    (define-key map "\C-c\C-j" #'imenu)
    ;; Indent specific
    (define-key map "\177" #'python-indent-dedent-line-backspace)
    (define-key map (kbd "<backtab>") #'python-indent-dedent-line)
    (define-key map "\C-c<" #'python-indent-shift-left)
    (define-key map "\C-c>" #'python-indent-shift-right)
    ;; Skeletons
    (define-key map "\C-c\C-tc" #'python-skeleton-class)
    (define-key map "\C-c\C-td" #'python-skeleton-def)
    (define-key map "\C-c\C-tf" #'python-skeleton-for)
    (define-key map "\C-c\C-ti" #'python-skeleton-if)
    (define-key map "\C-c\C-tm" #'python-skeleton-import)
    (define-key map "\C-c\C-tt" #'python-skeleton-try)
    (define-key map "\C-c\C-tw" #'python-skeleton-while)
    ;; Shell interaction
    (define-key map "\C-c\C-p" #'run-python)
    (define-key map "\C-c\C-s" #'python-shell-send-string)
    (define-key map "\C-c\C-e" #'python-shell-send-statement)
    (define-key map "\C-c\C-r" #'python-shell-send-region)
    (define-key map "\C-\M-x"  #'python-shell-send-defun)
    (define-key map "\C-c\C-c" #'python-shell-send-buffer)
    (define-key map "\C-c\C-l" #'python-shell-send-file)
    (define-key map "\C-c\C-z" #'python-shell-switch-to-shell)
    ;; Some util commands
    (define-key map "\C-c\C-v" #'python-check)
    (define-key map "\C-c\C-f" #'python-eldoc-at-point)
    (define-key map "\C-c\C-d" #'python-describe-at-point)
    ;; Utilities
    (substitute-key-definition #'complete-symbol #'completion-at-point
                               map global-map)
    (easy-menu-define python-menu map "Python Mode menu"
      '("Python"
        :help "Python-specific Features"
        ["Shift region left" python-indent-shift-left :active mark-active
         :help "Shift region left by a single indentation step"]
        ["Shift region right" python-indent-shift-right :active mark-active
         :help "Shift region right by a single indentation step"]
        "-"
        ["Start of def/class" beginning-of-defun
         :help "Go to start of outermost definition around point"]
        ["End of def/class" end-of-defun
         :help "Go to end of definition around point"]
        ["Mark def/class" mark-defun
         :help "Mark outermost definition around point"]
        ["Jump to def/class" imenu
         :help "Jump to a class or function definition"]
        "--"
        ("Skeletons")
        "---"
        ["Start interpreter" run-python
         :help "Run inferior Python process in a separate buffer"]
        ["Switch to shell" python-shell-switch-to-shell
         :help "Switch to running inferior Python process"]
        ["Eval string" python-shell-send-string
         :help "Eval string in inferior Python session"]
        ["Eval buffer" python-shell-send-buffer
         :help "Eval buffer in inferior Python session"]
        ["Eval statement" python-shell-send-statement
         :help "Eval statement in inferior Python session"]
        ["Eval region" python-shell-send-region
         :help "Eval region in inferior Python session"]
        ["Eval defun" python-shell-send-defun
         :help "Eval defun in inferior Python session"]
        ["Eval file" python-shell-send-file
         :help "Eval file in inferior Python session"]
        ["Debugger" pdb :help "Run pdb under GUD"]
        "----"
        ["Check file" python-check
         :help "Check file for errors"]
        ["Help on symbol" python-eldoc-at-point
         :help "Get help on symbol at point"]
        ["Complete symbol" completion-at-point
         :help "Complete symbol before point"]))
    map)
  "Keymap for `python-mode'.")

\f
;;; Python specialized rx

(defmacro python-rx (&rest regexps)
  "Python mode specialized rx macro.
This variant of `rx' supports common Python named REGEXPS."
  `(rx-let ((sp-bsnl (or space (and ?\\ ?\n)))
            (block-start       (seq symbol-start
                                    (or "def" "class" "if" "elif" "else" "try"
                                        "except" "finally" "for" "while" "with"
                                        ;; Python 3.10+ PEP634
                                        "match" "case"
                                        ;; Python 3.5+ PEP492
                                        (and "async" (+ space)
                                             (or "def" "for" "with")))
                                    symbol-end))
            (dedenter          (seq symbol-start
                                    (or "elif" "else" "except" "finally")
                                    symbol-end))
            (block-ender       (seq symbol-start
                                    (or
                                     "break" "continue" "pass" "raise" "return")
                                    symbol-end))
            (decorator         (seq line-start (* space) ?@ (any letter ?_)
                                    (* (any word ?_))))
            (defun             (seq symbol-start
                                    (or "def" "class"
                                        ;; Python 3.5+ PEP492
                                        (and "async" (+ space) "def"))
                                    symbol-end))
            (if-name-main      (seq line-start "if" (+ space) "__name__"
                                    (+ space) "==" (+ space)
                                    (any ?' ?\") "__main__" (any ?' ?\")
                                    (* space) ?:))
            (symbol-name       (seq (any letter ?_) (* (any word ?_))))
            (assignment-target (seq (? ?*)
                                    (* symbol-name ?.) symbol-name
                                    (? ?\[ (+ (not ?\])) ?\])))
            (grouped-assignment-target (seq (? ?*)
                                            (* symbol-name ?.) (group symbol-name)
                                            (? ?\[ (+ (not ?\])) ?\])))
            (open-paren        (or "{" "[" "("))
            (close-paren       (or "}" "]" ")"))
            (simple-operator   (any ?+ ?- ?/ ?& ?^ ?~ ?| ?* ?< ?> ?= ?%))
            (not-simple-operator (not (or simple-operator ?\n)))
            (operator          (or "==" ">=" "is" "not"
                                   "**" "//" "<<" ">>" "<=" "!="
                                   "+" "-" "/" "&" "^" "~" "|" "*" "<" ">"
                                   "=" "%"))
            (assignment-operator (or "+=" "-=" "*=" "/=" "//=" "%=" "**="
                                     ">>=" "<<=" "&=" "^=" "|="
                                     "="))
            (string-delimiter  (seq
                                ;; Match even number of backslashes.
                                (or (not (any ?\\ ?\' ?\")) point
                                    ;; Quotes might be preceded by an
                                    ;; escaped quote.
                                    (and (or (not (any ?\\)) point) ?\\
                                         (* ?\\ ?\\) (any ?\' ?\")))
                                (* ?\\ ?\\)
                                ;; Match single or triple quotes of any kind.
                                (group (or  "\"\"\"" "\"" "'''" "'"))))
            (coding-cookie (seq line-start ?# (* space)
                                (or
                                 ;; # coding=<encoding name>
                                 (: "coding" (or ?: ?=) (* space)
                                    (group-n 1 (+ (or word ?-))))
                                 ;; # -*- coding: <encoding name> -*-
                                 (: "-*-" (* space) "coding:" (* space)
                                    (group-n 1 (+ (or word ?-)))
                                    (* space) "-*-")
                                 ;; # vim: set fileencoding=<encoding name> :
                                 (: "vim:" (* space) "set" (+ space)
                                    "fileencoding" (* space) ?= (* space)
                                    (group-n 1 (+ (or word ?-)))
                                    (* space) ":")))))
     (rx ,@regexps)))

\f
;;; Font-lock and syntax

(eval-and-compile
  (defun python-syntax--context-compiler-macro (form type &optional syntax-ppss)
    (pcase type
      (''comment
       `(let ((ppss (or ,syntax-ppss (syntax-ppss))))
          (and (nth 4 ppss) (nth 8 ppss))))
      (''string
       `(let ((ppss (or ,syntax-ppss (syntax-ppss))))
          (and (nth 3 ppss) (nth 8 ppss))))
      (''paren
       `(nth 1 (or ,syntax-ppss (syntax-ppss))))
      (_ form))))

(defun python-syntax-context (type &optional syntax-ppss)
  "Return non-nil if point is on TYPE using SYNTAX-PPSS.
TYPE can be `comment', `string' or `paren'.  It returns the start
character address of the specified TYPE."
  (declare (compiler-macro python-syntax--context-compiler-macro))
  (let ((ppss (or syntax-ppss (syntax-ppss))))
    (pcase type
      ('comment (and (nth 4 ppss) (nth 8 ppss)))
      ('string (and (nth 3 ppss) (nth 8 ppss)))
      ('paren (nth 1 ppss))
      (_ nil))))

(defun python-syntax-context-type (&optional syntax-ppss)
  "Return the context type using SYNTAX-PPSS.
The type returned can be `comment', `string' or `paren'."
  (let ((ppss (or syntax-ppss (syntax-ppss))))
    (cond
     ((nth 8 ppss) (if (nth 4 ppss) 'comment 'string))
     ((nth 1 ppss) 'paren))))

(defsubst python-syntax-comment-or-string-p (&optional ppss)
  "Return non-nil if PPSS is inside comment or string."
  (nth 8 (or ppss (syntax-ppss))))

(defsubst python-syntax-closing-paren-p ()
  "Return non-nil if char after point is a closing paren."
  (eql (syntax-class (syntax-after (point)))
       (syntax-class (string-to-syntax ")"))))

(define-obsolete-function-alias
  'python-info-ppss-context #'python-syntax-context "24.3")

(define-obsolete-function-alias
  'python-info-ppss-context-type #'python-syntax-context-type "24.3")

(define-obsolete-function-alias
  'python-info-ppss-comment-or-string-p
  #'python-syntax-comment-or-string-p "24.3")

(defun python-font-lock-syntactic-face-function (state)
  "Return syntactic face given STATE."
  (if (nth 3 state)
      (if (python-info-docstring-p state)
          font-lock-doc-face
        font-lock-string-face)
    font-lock-comment-face))

(defun python--f-string-p (ppss)
  "Return non-nil if the pos where PPSS was found is inside an f-string."
  (and (nth 3 ppss)
       (let ((spos (1- (nth 8 ppss))))
         (and (memq (char-after spos) '(?f ?F))
              (or (< (point-min) spos)
                  (not (memq (char-syntax (char-before spos)) '(?w ?_))))))))

(defun python--font-lock-f-strings (limit)
  "Mark {...} holes as being code.
Remove the (presumably `font-lock-string-face') `face' property from
the {...} holes that appear within f-strings."
  ;; FIXME: This will fail to properly highlight strings appearing
  ;; within the {...} of an f-string.
  ;; We could presumably fix it by running
  ;; `font-lock-fontify-syntactically-region' (as is done in
  ;; `sm-c--cpp-fontify-syntactically', for example) after removing
  ;; the `face' property, but I'm not sure it's worth the effort and
  ;; the risks.
  (let ((ppss (syntax-ppss)))
    (while
        (progn
          (while (and (not (python--f-string-p ppss))
                      (re-search-forward "\\<f['\"]" limit 'move))
            (setq ppss (syntax-ppss)))
          (< (point) limit))
      (cl-assert (python--f-string-p ppss))
      (let ((send (save-excursion
                   (goto-char (nth 8 ppss))
                   (condition-case nil
                       (progn (let ((forward-sexp-function nil))
                                (forward-sexp 1))
                              (min limit (1- (point))))
                     (scan-error limit)))))
        (while (re-search-forward "{" send t)
          (if (eq ?\{ (char-after))
              (forward-char 1)          ;Just skip over {{
            (let ((beg (match-beginning 0))
                  (end (condition-case nil
                           (progn (up-list 1) (min send (point)))
                         (scan-error send))))
              (goto-char end)
              (put-text-property beg end 'face nil))))
        (goto-char (min limit (1+ send)))
        (setq ppss (syntax-ppss))))))

(defvar python-font-lock-keywords-level-1
  `((,(python-rx symbol-start "def" (1+ space) (group symbol-name))
     (1 font-lock-function-name-face))
    (,(python-rx symbol-start "class" (1+ space) (group symbol-name))
     (1 font-lock-type-face)))
  "Font lock keywords to use in `python-mode' for level 1 decoration.

This is the minimum decoration level, including function and
class declarations.")

(defvar python-font-lock-keywords-level-2
  `(,@python-font-lock-keywords-level-1
    ,(rx symbol-start
         (or
          "and" "del" "from" "not" "while" "as" "elif" "global" "or" "with"
          "assert" "else" "if" "pass" "yield" "break" "except" "import" "class"
          "in" "raise" "continue" "finally" "is" "return" "def" "for" "lambda"
          "try"
          ;; False, None, and True are listed as keywords on the Python 3
          ;; documentation, but since they also qualify as constants they are
          ;; fontified like that in order to keep font-lock consistent between
          ;; Python versions.
          "nonlocal"
          ;; Python 3.5+ PEP492
          (and "async" (+ space) (or "def" "for" "with"))
          "await"
          ;; Python 3.10+
          "match" "case"
          ;; Extra:
          "self")
         symbol-end)
    ;; Builtins
    (,(rx symbol-start
          (or
           "abs" "all" "any" "bin" "bool" "callable" "chr" "classmethod"
           "compile" "complex" "delattr" "dict" "dir" "divmod" "enumerate"
           "eval" "filter" "float" "format" "frozenset" "getattr" "globals"
           "hasattr" "hash" "help" "hex" "id" "input" "int" "isinstance"
           "issubclass" "iter" "len" "list" "locals" "map" "max" "memoryview"
           "min" "next" "object" "oct" "open" "ord" "pow" "print" "property"
           "range" "repr" "reversed" "round" "set" "setattr" "slice" "sorted"
           "staticmethod" "str" "sum" "super" "tuple" "type" "vars" "zip"
           "__import__"
           ;; Python 2:
           "basestring" "cmp" "execfile" "file" "long" "raw_input" "reduce"
           "reload" "unichr" "unicode" "xrange" "apply" "buffer" "coerce"
           "intern"
           ;; Python 3:
           "ascii" "breakpoint" "bytearray" "bytes" "exec"
           ;; Special attributes:
           ;; https://docs.python.org/3/reference/datamodel.html
           "__annotations__" "__closure__" "__code__"
           "__defaults__" "__dict__" "__doc__" "__globals__"
           "__kwdefaults__" "__name__" "__module__" "__package__"
           "__qualname__"
           ;; Extras:
           "__all__")
          symbol-end) . font-lock-builtin-face))
  "Font lock keywords to use in `python-mode' for level 2 decoration.

This is the medium decoration level, including everything in
`python-font-lock-keywords-level-1', as well as keywords and
builtins.")

(defun python-font-lock-assignment-matcher (regexp)
  "Font lock matcher for assignments based on REGEXP.
Search for next occurrence if REGEXP matched within a `paren'
context (to avoid, e.g., default values for arguments or passing
arguments by name being treated as assignments) or is followed by
an '=' sign (to avoid '==' being treated as an assignment.  Set
point to the position one character before the end of the
occurrence found so that subsequent searches can detect the '='
sign in chained assignment."
  (lambda (limit)
    (cl-loop while (re-search-forward regexp limit t)
             unless (or (python-syntax-context 'paren)
                        (equal (char-after) ?=))
               return (progn (backward-char) t))))

(defvar python-font-lock-keywords-maximum-decoration
  `((python--font-lock-f-strings)
    ,@python-font-lock-keywords-level-2
    ;; Constants
    (,(rx symbol-start
          (or
           "Ellipsis" "False" "None" "NotImplemented" "True" "__debug__"
           ;; copyright, license, credits, quit and exit are added by the site
           ;; module and they are not intended to be used in programs
           "copyright" "credits" "exit" "license" "quit")
          symbol-end)
     . font-lock-constant-face)
    ;; Decorators.
    (,(rx line-start (* (any " \t")) (group "@" (1+ (or word ?_))
                                            (0+ "." (1+ (or word ?_)))))
     (1 font-lock-type-face))
    ;; Builtin Exceptions
    (,(rx symbol-start
          (or
           ;; Python 2 and 3:
           "ArithmeticError" "AssertionError" "AttributeError" "BaseException"
           "BufferError" "BytesWarning" "DeprecationWarning" "EOFError"
           "EnvironmentError" "Exception" "FloatingPointError" "FutureWarning"
           "GeneratorExit" "IOError" "ImportError" "ImportWarning"
           "IndentationError" "IndexError" "KeyError" "KeyboardInterrupt"
           "LookupError" "MemoryError" "NameError" "NotImplementedError"
           "OSError" "OverflowError" "PendingDeprecationWarning"
           "ReferenceError" "RuntimeError" "RuntimeWarning" "StopIteration"
           "SyntaxError" "SyntaxWarning" "SystemError" "SystemExit" "TabError"
           "TypeError" "UnboundLocalError" "UnicodeDecodeError"
           "UnicodeEncodeError" "UnicodeError" "UnicodeTranslateError"
           "UnicodeWarning" "UserWarning" "ValueError" "Warning"
           "ZeroDivisionError"
           ;; Python 2:
           "StandardError"
           ;; Python 3:
           "BlockingIOError" "BrokenPipeError" "ChildProcessError"
           "ConnectionAbortedError" "ConnectionError" "ConnectionRefusedError"
           "ConnectionResetError" "FileExistsError" "FileNotFoundError"
           "InterruptedError" "IsADirectoryError" "NotADirectoryError"
           "PermissionError" "ProcessLookupError" "RecursionError"
           "ResourceWarning" "StopAsyncIteration" "TimeoutError"
           ;; OS specific
           "VMSError" "WindowsError"
           )
          symbol-end)
     . font-lock-type-face)
    ;; multiple assignment
    ;; (note that type hints are not allowed for multiple assignments)
    ;;   a, b, c = 1, 2, 3
    ;;   a, *b, c = 1, 2, 3, 4, 5
    ;;   [a, b] = (1, 2)
    ;;   (l[1], l[2]) = (10, 11)
    ;;   (a, b, c, *d) = *x, y = 5, 6, 7, 8, 9
    ;;   (a,) = 'foo'
    ;;   (*a,) = ['foo', 'bar', 'baz']
    ;;   d.x, d.y[0], *d.z = 'a', 'b', 'c', 'd', 'e'
    ;; and variants thereof
    ;; the cases
    ;;   (a) = 5
    ;;   [a] = 5,
    ;;   [*a] = 5, 6
    ;; are handled separately below
    (,(python-font-lock-assignment-matcher
        (python-rx (? (or "[" "(") (* space))
                   grouped-assignment-target (* space) ?, (* space)
                   (* assignment-target (* space) ?, (* space))
                   (? assignment-target (* space))
                   (? ?, (* space))
                   (? (or ")" "]") (* space))
                   (group assignment-operator)))
     (1 font-lock-variable-name-face)
     (,(python-rx grouped-assignment-target)
      (progn
        (goto-char (match-end 1))       ; go back after the first symbol
        (match-beginning 2))            ; limit the search until the assignment
      nil
      (1 font-lock-variable-name-face)))
    ;; single assignment with type hints, e.g.
    ;;   a: int = 5
    ;;   b: Tuple[Optional[int], Union[Sequence[str], str]] = (None, 'foo')
    ;;   c: Collection = {1, 2, 3}
    ;;   d: Mapping[int, str] = {1: 'bar', 2: 'baz'}
    (,(python-font-lock-assignment-matcher
        (python-rx grouped-assignment-target (* space)
                   (? ?: (* space) (+ not-simple-operator) (* space))
                   assignment-operator))
     (1 font-lock-variable-name-face))
    ;; special cases
    ;;   (a) = 5
    ;;   [a] = 5,
    ;;   [*a] = 5, 6
    (,(python-font-lock-assignment-matcher
       (python-rx (or line-start ?\; ?=) (* space)
                  (or "[" "(") (* space)
                  grouped-assignment-target (* space)
                  (or ")" "]") (* space)
                  assignment-operator))
     (1 font-lock-variable-name-face)))
  "Font lock keywords to use in `python-mode' for maximum decoration.

This decoration level includes everything in
`python-font-lock-keywords-level-2', as well as constants,
decorators, exceptions, and assignments.")

(defvar python-font-lock-keywords
  '(python-font-lock-keywords-level-1   ; When `font-lock-maximum-decoration' is nil.
    python-font-lock-keywords-level-1   ; When `font-lock-maximum-decoration' is 1.
    python-font-lock-keywords-level-2   ; When `font-lock-maximum-decoration' is 2.
    python-font-lock-keywords-maximum-decoration ; When `font-lock-maximum-decoration'
                                                 ; is more than 1, or t (which it is,
                                                 ; by default).
    )
  "List of font lock keyword specifications to use in `python-mode'.

Which one will be chosen depends on the value of
`font-lock-maximum-decoration'.")


(defconst python-syntax-propertize-function
  (syntax-propertize-rules
   ((rx (or "\"\"\"" "'''"))
    (0 (ignore (python-syntax-stringify))))))

(define-obsolete-variable-alias 'python--prettify-symbols-alist
  'python-prettify-symbols-alist "26.1")

(defvar python-prettify-symbols-alist
  '(("lambda"  . ?λ)
    ("and" . ?∧)
    ("or" . ?∨))
  "Value for `prettify-symbols-alist' in `python-mode'.")

(defsubst python-syntax-count-quotes (quote-char &optional point limit)
  "Count number of quotes around point (max is 3).
QUOTE-CHAR is the quote char to count.  Optional argument POINT is
the point where scan starts (defaults to current point), and LIMIT
is used to limit the scan."
  (let ((i 0))
    (while (and (< i 3)
                (or (not limit) (< (+ point i) limit))
                (eq (char-after (+ point i)) quote-char))
      (setq i (1+ i)))
    i))

(defun python-syntax-stringify ()
  "Put `syntax-table' property correctly on single/triple quotes."
  (let* ((ppss (save-excursion (backward-char 3) (syntax-ppss)))
         (string-start (and (eq t (nth 3 ppss)) (nth 8 ppss)))
         (quote-starting-pos (- (point) 3))
         (quote-ending-pos (point)))
    (cond ((or (nth 4 ppss)             ;Inside a comment
               (and string-start
                    ;; Inside of a string quoted with different triple quotes.
                    (not (eql (char-after string-start)
                              (char-after quote-starting-pos)))))
           ;; Do nothing.
           nil)
          ((nth 5 ppss)
           ;; The first quote is escaped, so it's not part of a triple quote!
           (goto-char (1+ quote-starting-pos)))
          ((null string-start)
           ;; This set of quotes delimit the start of a string.  Put
           ;; string fence syntax on last quote. (bug#49518)
           ;; FIXME: This makes sexp-movement a bit suboptimal since """a"""
           ;; is now treated as 3 strings.
           ;; We could probably have our cake and eat it too by
           ;; putting the string fence on the first quote and then
           ;; convincing `syntax-ppss-flush-cache' to flush to before
           ;; that fence when any char of the 3-char delimiter
           ;; is modified.
           (put-text-property (1- quote-ending-pos) quote-ending-pos
                              'syntax-table (string-to-syntax "|")))
          (t
           ;; This set of quotes delimit the end of a string.  Put
           ;; string fence syntax on first quote. (bug#49518)
           (put-text-property quote-starting-pos (1+ quote-starting-pos)
                              'syntax-table (string-to-syntax "|"))))))

(defvar python-mode-syntax-table
  (let ((table (make-syntax-table)))
    ;; Give punctuation syntax to ASCII that normally has symbol
    ;; syntax or has word syntax and isn't a letter.
    (let ((symbol (string-to-syntax "_"))
          (sst (standard-syntax-table)))
      (dotimes (i 128)
        (unless (= i ?_)
          (if (equal symbol (aref sst i))
              (modify-syntax-entry i "." table)))))
    (modify-syntax-entry ?$ "." table)
    (modify-syntax-entry ?% "." table)
    ;; exceptions
    (modify-syntax-entry ?# "<" table)
    (modify-syntax-entry ?\n ">" table)
    (modify-syntax-entry ?' "\"" table)
    (modify-syntax-entry ?` "$" table)
    table)
  "Syntax table for Python files.")

(defvar python-dotty-syntax-table
  (let ((table (make-syntax-table python-mode-syntax-table)))
    (modify-syntax-entry ?. "w" table)
    (modify-syntax-entry ?_ "w" table)
    table)
  "Dotty syntax table for Python files.
It makes underscores and dots word constituent chars.")

\f
;;; Indentation

(define-obsolete-variable-alias
  'python-indent 'python-indent-offset "24.3")

(defcustom python-indent-offset 4
  "Default indentation offset for Python."
  :type 'integer
  :safe 'integerp)

(define-obsolete-variable-alias
  'python-guess-indent 'python-indent-guess-indent-offset "24.3")

(defcustom python-indent-guess-indent-offset t
  "Non-nil tells Python mode to guess `python-indent-offset' value."
  :type 'boolean
  :safe 'booleanp)

(defcustom python-indent-guess-indent-offset-verbose t
  "Non-nil means to emit a warning when indentation guessing fails."
  :version "25.1"
  :type 'boolean
  :safe' booleanp)

(defcustom python-indent-trigger-commands
  '(indent-for-tab-command yas-expand yas/expand)
  "Commands that might trigger a `python-indent-line' call."
  :type '(repeat symbol))

(defcustom python-indent-def-block-scale 2
  "Multiplier applied to indentation inside multi-line def blocks."
  :version "26.1"
  :type 'integer
  :safe 'natnump)

(defvar python-indent-current-level 0
  "Deprecated var available for compatibility.")

(defvar python-indent-levels '(0)
  "Deprecated var available for compatibility.")

(make-obsolete-variable
 'python-indent-current-level
 "The indentation API changed to avoid global state.
The function `python-indent-calculate-levels' does not use it
anymore.  If you were defadvising it and or depended on this
variable for indentation customizations, refactor your code to
work on `python-indent-calculate-indentation' instead."
 "24.5")

(make-obsolete-variable
 'python-indent-levels
 "The indentation API changed to avoid global state.
The function `python-indent-calculate-levels' does not use it
anymore.  If you were defadvising it and or depended on this
variable for indentation customizations, refactor your code to
work on `python-indent-calculate-indentation' instead."
 "24.5")

(defun python-indent-guess-indent-offset ()
  "Guess and set `python-indent-offset' for the current buffer."
  (interactive)
  (save-excursion
    (save-restriction
      (widen)
      (goto-char (point-min))
      (let ((block-end))
        (while (and (not block-end)
                    (re-search-forward
                     (python-rx line-start block-start) nil t))
          (when (and
                 (not (python-syntax-context-type))
                 (progn
                   (goto-char (line-end-position))
                   (python-util-forward-comment -1)
                   (if (equal (char-before) ?:)
                       t
                     (forward-line 1)
                     (when (python-info-block-continuation-line-p)
                       (while (and (python-info-continuation-line-p)
                                   (not (eobp)))
                         (forward-line 1))
                       (python-util-forward-comment -1)
                       (when (equal (char-before) ?:)
                         t)))))
            (setq block-end (point-marker))))
        (let ((indentation
               (when block-end
                 (goto-char block-end)
                 (python-util-forward-comment)
                 (current-indentation))))
          (if (and indentation (not (zerop indentation)))
              (setq-local python-indent-offset indentation)
            (when python-indent-guess-indent-offset-verbose
              (message "Can't guess python-indent-offset, using defaults: %s"
                       python-indent-offset))))))))

(defun python-indent-context ()
  "Get information about the current indentation context.
Context is returned in a cons with the form (STATUS . START).

STATUS can be one of the following:

keyword
-------

:after-comment
 - Point is after a comment line.
 - START is the position of the \"#\" character.
:inside-string
 - Point is inside string.
 - START is the position of the first quote that starts it.
:no-indent
 - No possible indentation case matches.
 - START is always zero.

:inside-paren
 - Fallback case when point is inside paren.
 - START is the first non space char position *after* the open paren.
:inside-paren-at-closing-nested-paren
 - Point is on a line that contains a nested paren closer.
 - START is the position of the open paren it closes.
:inside-paren-at-closing-paren
 - Point is on a line that contains a paren closer.
 - START is the position of the open paren.
:inside-paren-newline-start
 - Point is inside a paren with items starting in their own line.
 - START is the position of the open paren.
:inside-paren-newline-start-from-block
 - Point is inside a paren with items starting in their own line
   from a block start.
 - START is the position of the open paren.

:after-backslash
 - Fallback case when point is after backslash.
 - START is the char after the position of the backslash.
:after-backslash-assignment-continuation
 - Point is after a backslashed assignment.
 - START is the char after the position of the backslash.
:after-backslash-block-continuation
 - Point is after a backslashed block continuation.
 - START is the char after the position of the backslash.
:after-backslash-dotted-continuation
 - Point is after a backslashed dotted continuation.  Previous
   line must contain a dot to align with.
 - START is the char after the position of the backslash.
:after-backslash-first-line
 - First line following a backslashed continuation.
 - START is the char after the position of the backslash.

:after-block-end
 - Point is after a line containing a block ender.
 - START is the position where the ender starts.
:after-block-start
 - Point is after a line starting a block.
 - START is the position where the block starts.
:after-line
 - Point is after a simple line.
 - START is the position where the previous line starts.
:at-dedenter-block-start
 - Point is on a line starting a dedenter block.
 - START is the position where the dedenter block starts."
    (let ((ppss (save-excursion
                  (beginning-of-line)
                  (syntax-ppss))))
      (cond
       ;; Beginning of buffer.
       ((= (line-number-at-pos) 1)
        (cons :no-indent 0))
       ;; Inside a string.
       ((let ((start (python-syntax-context 'string ppss)))
          (when start
            (cons (if (python-info-docstring-p)
                      :inside-docstring
                    :inside-string) start))))
       ;; Inside a paren.
       ((let* ((start (python-syntax-context 'paren ppss))
               (starts-in-newline
                (when start
                  (save-excursion
                    (goto-char start)
                    (forward-char)
                    (not
                     (= (line-number-at-pos)
                        (progn
                          (python-util-forward-comment)
                          (line-number-at-pos))))))))
          (when start
            (cond
             ;; Current line only holds the closing paren.
             ((save-excursion
                (skip-syntax-forward " ")
                (when (and (python-syntax-closing-paren-p)
                           (progn
                             (forward-char 1)
                             (not (python-syntax-context 'paren))))
                  (cons :inside-paren-at-closing-paren start))))
             ;; Current line only holds a closing paren for nested.
             ((save-excursion
                (back-to-indentation)
                (python-syntax-closing-paren-p))
              (cons :inside-paren-at-closing-nested-paren start))
             ;; This line starts from an opening block in its own line.
             ((save-excursion
                (goto-char start)
                (when (and
                       starts-in-newline
                       (save-excursion
                         (back-to-indentation)
                         (looking-at (python-rx block-start))))
                  (cons
                   :inside-paren-newline-start-from-block start))))
             (starts-in-newline
              (cons :inside-paren-newline-start start))
             ;; General case.
             (t (cons :inside-paren
                      (save-excursion
                        (goto-char (1+ start))
                        (skip-syntax-forward "(" 1)
                        (skip-syntax-forward " ")
                        (point))))))))
       ;; After backslash.
       ((let ((start (when (not (python-syntax-comment-or-string-p ppss))
                       (python-info-line-ends-backslash-p
                        (1- (line-number-at-pos))))))
          (when start
            (cond
             ;; Continuation of dotted expression.
             ((save-excursion
                (back-to-indentation)
                (when (eq (char-after) ?\.)
                  ;; Move point back until it's not inside a paren.
                  (while (prog2
                             (forward-line -1)
                             (and (not (bobp))
                                  (python-syntax-context 'paren))))
                  (goto-char (line-end-position))
                  (while (and (search-backward
                               "." (line-beginning-position) t)
                              (python-syntax-context-type)))
                  ;; Ensure previous statement has dot to align with.
                  (when (and (eq (char-after) ?\.)
                             (not (python-syntax-context-type)))
                    (cons :after-backslash-dotted-continuation (point))))))
             ;; Continuation of block definition.
             ((let ((block-continuation-start
                     (python-info-block-continuation-line-p)))
                (when block-continuation-start
                  (save-excursion
                    (goto-char block-continuation-start)
                    (re-search-forward
                     (python-rx block-start (* space))
                     (line-end-position) t)
                    (cons :after-backslash-block-continuation (point))))))
             ;; Continuation of assignment.
             ((let ((assignment-continuation-start
                     (python-info-assignment-continuation-line-p)))
                (when assignment-continuation-start
                  (save-excursion
                    (goto-char assignment-continuation-start)
                    (cons :after-backslash-assignment-continuation (point))))))
             ;; First line after backslash continuation start.
             ((save-excursion
                (goto-char start)
                (when (or (= (line-number-at-pos) 1)
                          (not (python-info-beginning-of-backslash
                                (1- (line-number-at-pos)))))
                  (cons :after-backslash-first-line start))))
             ;; General case.
             (t (cons :after-backslash start))))))
       ;; After beginning of block.
       ((let ((start (save-excursion
                       (back-to-indentation)
                       (python-util-forward-comment -1)
                       (when (equal (char-before) ?:)
                         (python-nav-beginning-of-block)))))
          (when start
            (cons :after-block-start start))))
       ;; At dedenter statement.
       ((let ((start (python-info-dedenter-statement-p)))
          (when start
            (cons :at-dedenter-block-start start))))
       ;; After normal line, comment or ender (default case).
       ((save-excursion
          (back-to-indentation)
          (skip-chars-backward " \t\n")
          (if (bobp)
              (cons :no-indent 0)
            (python-nav-beginning-of-statement)
            (cons
             (cond ((python-info-current-line-comment-p)
                    :after-comment)
                   ((save-excursion
                      (goto-char (line-end-position))
                      (python-util-forward-comment -1)
                      (python-nav-beginning-of-statement)
                      (looking-at (python-rx block-ender)))
                    :after-block-end)
                   (t :after-line))
             (point))))))))

(defun python-indent--calculate-indentation ()
  "Internal implementation of `python-indent-calculate-indentation'.
May return an integer for the maximum possible indentation at
current context or a list of integers.  The latter case is only
happening for :at-dedenter-block-start context since the
possibilities can be narrowed to specific indentation points."
    (save-excursion
      (pcase (python-indent-context)
        (`(:no-indent . ,_) (prog-first-column)) ; usually 0
        (`(,(or :after-line
                :after-comment
                :inside-string
                :after-backslash) . ,start)
         ;; Copy previous indentation.
         (goto-char start)
         (current-indentation))
        (`(,(or :inside-paren-at-closing-paren
                :inside-paren-at-closing-nested-paren) . ,start)
         (goto-char (+ 1 start))
         (if (looking-at "[ \t]*\\(?:#\\|$\\)")
             ;; Copy previous indentation.
             (current-indentation)
           ;; Align with opening paren.
           (current-column)))
        (`(:inside-docstring . ,start)
         (let* ((line-indentation (current-indentation))
                (base-indent (progn
                               (goto-char start)
                               (current-indentation))))
           (max line-indentation base-indent)))
        (`(,(or :after-block-start
                :after-backslash-first-line
                :after-backslash-assignment-continuation
                :inside-paren-newline-start) . ,start)
         ;; Add one indentation level.
         (goto-char start)
         (+ (current-indentation) python-indent-offset))
        (`(,(or :inside-paren
                :after-backslash-block-continuation
                :after-backslash-dotted-continuation) . ,start)
         ;; Use the column given by the context.
         (goto-char start)
         (current-column))
        (`(:after-block-end . ,start)
         ;; Subtract one indentation level.
         (goto-char start)
         (- (current-indentation) python-indent-offset))
        (`(:at-dedenter-block-start . ,_)
         ;; List all possible indentation levels from opening blocks.
         (let ((opening-block-start-points
                (python-info-dedenter-opening-block-positions)))
           (if (not opening-block-start-points)
               (prog-first-column) ; if not found default to first column
             (mapcar (lambda (pos)
                       (save-excursion
                         (goto-char pos)
                         (current-indentation)))
                     opening-block-start-points))))
        (`(,(or :inside-paren-newline-start-from-block) . ,start)
         (goto-char start)
         (+ (current-indentation)
            (* python-indent-offset python-indent-def-block-scale))))))

(defun python-indent--calculate-levels (indentation)
  "Calculate levels list given INDENTATION.
Argument INDENTATION can either be an integer or a list of
integers.  Levels are returned in ascending order, and in the
case INDENTATION is a list, this order is enforced."
  (if (listp indentation)
      (sort (copy-sequence indentation) #'<)
    (nconc (number-sequence (prog-first-column) (1- indentation)
                            python-indent-offset)
           (list indentation))))

(defun python-indent--previous-level (levels indentation)
  "Return previous level from LEVELS relative to INDENTATION."
  (let* ((levels (sort (copy-sequence levels) #'>))
         (default (car levels)))
    (catch 'return
      (dolist (level levels)
        (when (funcall #'< level indentation)
          (throw 'return level)))
      default)))

(defun python-indent-calculate-indentation (&optional previous)
  "Calculate indentation.
Get indentation of PREVIOUS level when argument is non-nil.
Return the max level of the cycle when indentation reaches the
minimum."
  (let* ((indentation (python-indent--calculate-indentation))
         (levels (python-indent--calculate-levels indentation)))
    (if previous
        (python-indent--previous-level levels (current-indentation))
      (if levels
          (apply #'max levels)
        (prog-first-column)))))

(defun python-indent-line (&optional previous)
  "Internal implementation of `python-indent-line-function'.
Use the PREVIOUS level when argument is non-nil, otherwise indent
to the maximum available level.  When indentation is the minimum
possible and PREVIOUS is non-nil, cycle back to the maximum
level."
  (let ((follow-indentation-p
         ;; Check if point is within indentation.
         (and (<= (line-beginning-position) (point))
              (>= (+ (line-beginning-position)
                     (current-indentation))
                  (point)))))
    (save-excursion
      (indent-line-to
       (python-indent-calculate-indentation previous))
      (python-info-dedenter-opening-block-message))
    (when follow-indentation-p
      (back-to-indentation))))

(defun python-indent-calculate-levels ()
  "Return possible indentation levels."
  (python-indent--calculate-levels
   (python-indent--calculate-indentation)))

(defun python-indent-line-function ()
  "`indent-line-function' for Python mode.
When the variable `last-command' is equal to one of the symbols
inside `python-indent-trigger-commands' it cycles possible
indentation levels from right to left."
  (python-indent-line
   (and (memq this-command python-indent-trigger-commands)
        (eq last-command this-command))))

(defun python-indent-dedent-line ()
  "De-indent current line."
  (interactive "*")
  (when (and (not (bolp))
           (not (python-syntax-comment-or-string-p))
           (= (current-indentation) (current-column)))
      (python-indent-line t)
      t))

(defun python-indent-dedent-line-backspace (arg)
  "De-indent current line.
Argument ARG is passed to `backward-delete-char-untabify' when
point is not in between the indentation."
  (interactive "*p")
  (unless (python-indent-dedent-line)
    (backward-delete-char-untabify arg)))

(put 'python-indent-dedent-line-backspace 'delete-selection 'supersede)

(defun python-indent-region (start end)
  "Indent a Python region automagically.

Called from a program, START and END specify the region to indent."
  (let ((deactivate-mark nil))
    (save-excursion
      (goto-char end)
      (setq end (point-marker))
      (goto-char start)
      (or (bolp) (forward-line 1))
      (while (< (point) end)
        (or (and (bolp) (eolp))
            (when (and
                   ;; Skip if previous line is empty or a comment.
                   (save-excursion
                     (let ((line-is-comment-p
                            (python-info-current-line-comment-p)))
                       (forward-line -1)
                       (not
                        (or (and (python-info-current-line-comment-p)
                                 ;; Unless this line is a comment too.
                                 (not line-is-comment-p))
                            (python-info-current-line-empty-p)))))
                   ;; Don't mess with strings, unless it's the
                   ;; enclosing set of quotes or a docstring.
                   (or (not (python-syntax-context 'string))
                       (equal
                        (syntax-after
                         (+ (1- (point))
                            (current-indentation)
                            (python-syntax-count-quotes (char-after) (point))))
                        (string-to-syntax "|"))
                       (python-info-docstring-p))
                   ;; Skip if current line is a block start, a
                   ;; dedenter or block ender.
                   (save-excursion
                     (back-to-indentation)
                     (not (looking-at
                           (python-rx
                            (or block-start dedenter block-ender))))))
              (python-indent-line)))
        (forward-line 1))
      (move-marker end nil))))

(defun python-indent-shift-left (start end &optional count)
  "Shift lines contained in region START END by COUNT columns to the left.
COUNT defaults to `python-indent-offset'.  If region isn't
active, the current line is shifted.  The shifted region includes
the lines in which START and END lie.  An error is signaled if
any lines in the region are indented less than COUNT columns."
  (interactive
   (if mark-active
       (list (region-beginning) (region-end) current-prefix-arg)
     (list (line-beginning-position) (line-end-position) current-prefix-arg)))
  (if count
      (setq count (prefix-numeric-value count))
    (setq count python-indent-offset))
  (when (> count 0)
    (let ((deactivate-mark nil))
      (save-excursion
        (goto-char start)
        (while (< (point) end)
          (if (and (< (current-indentation) count)
                   (not (looking-at "[ \t]*$")))
              (user-error "Can't shift all lines enough"))
          (forward-line))
        (indent-rigidly start end (- count))))))

(defun python-indent-shift-right (start end &optional count)
  "Shift lines contained in region START END by COUNT columns to the right.
COUNT defaults to `python-indent-offset'.  If region isn't
active, the current line is shifted.  The shifted region includes
the lines in which START and END lie."
  (interactive
   (if mark-active
       (list (region-beginning) (region-end) current-prefix-arg)
     (list (line-beginning-position) (line-end-position) current-prefix-arg)))
  (let ((deactivate-mark nil))
    (setq count (if count (prefix-numeric-value count)
                  python-indent-offset))
    (indent-rigidly start end count)))

(defun python-indent-post-self-insert-function ()
  "Adjust indentation after insertion of some characters.
This function is intended to be added to `post-self-insert-hook.'
If a line renders a paren alone, after adding a char before it,
the line will be re-indented automatically if needed."
  (when (and electric-indent-mode
             (eq (char-before) last-command-event)
             (not (python-syntax-context 'string))
             (save-excursion
               (beginning-of-line)
               (not (python-syntax-context 'string (syntax-ppss)))))
    (cond
     ;; Electric indent inside parens
     ((and
       (not (bolp))
       (let ((paren-start (python-syntax-context 'paren)))
         ;; Check that point is inside parens.
         (when paren-start
           (not
            ;; Filter the case where input is happening in the same
            ;; line where the open paren is.
            (= (line-number-at-pos)
               (line-number-at-pos paren-start)))))
       ;; When content has been added before the closing paren or a
       ;; comma has been inserted, it's ok to do the trick.
       (or
        (memq (char-after) '(?\) ?\] ?\}))
        (eq (char-before) ?,)))
      (save-excursion
        (goto-char (line-beginning-position))
        (let ((indentation (python-indent-calculate-indentation)))
          (when (and (numberp indentation) (< (current-indentation) indentation))
            (indent-line-to indentation)))))
     ;; Electric colon
     ((and (eq ?: last-command-event)
           (memq ?: electric-indent-chars)
           (not current-prefix-arg)
           ;; Trigger electric colon only at end of line
           (eolp)
           ;; Avoid re-indenting on extra colon
           (not (equal ?: (char-before (1- (point)))))
           (not (python-syntax-comment-or-string-p)))
      ;; Just re-indent dedenters
      (let ((dedenter-pos (python-info-dedenter-statement-p)))
        (when dedenter-pos
          (let ((start (copy-marker dedenter-pos))
                (end (point-marker)))
            (save-excursion
              (goto-char start)
              (python-indent-line)
              (unless (= (line-number-at-pos start)
                         (line-number-at-pos end))
                ;; Reindent region if this is a multiline statement
                (python-indent-region start end))))))))))

\f
;;; Mark

(defun python-mark-defun (&optional allow-extend)
  "Put mark at end of this defun, point at beginning.
The defun marked is the one that contains point or follows point.

Interactively (or with ALLOW-EXTEND non-nil), if this command is
repeated or (in Transient Mark mode) if the mark is active, it
marks the next defun after the ones already marked."
  (interactive "p")
  (when (python-info-looking-at-beginning-of-defun)
    (end-of-line 1))
  (mark-defun allow-extend))

\f
;;; Navigation

(defcustom python-forward-sexp-function #'python-nav-forward-sexp
  "Function to use when navigating between expressions."
  :version "28.1"
  :type '(choice (const :tag "Python blocks" python-nav-forward-sexp)
                 (const :tag "CC-mode like" nil)
                 function))

(defvar python-nav-beginning-of-defun-regexp
  (python-rx line-start (* space) defun (+ sp-bsnl) (group symbol-name))
  "Regexp matching class or function definition.
The name of the defun should be grouped so it can be retrieved
via `match-string'.")

(defun python-nav--beginning-of-defun (&optional arg)
  "Internal implementation of `python-nav-beginning-of-defun'.
With positive ARG search backwards, else search forwards."
  (when (or (null arg) (= arg 0)) (setq arg 1))
  (let* ((re-search-fn (if (> arg 0)
                           #'re-search-backward
                         #'re-search-forward))
         (line-beg-pos (line-beginning-position))
         (line-content-start (+ line-beg-pos (current-indentation)))
         (pos (point-marker))
         (min-indentation (if (python-info-current-line-empty-p)
                              most-positive-fixnum
                            (current-indentation)))
         (body-indentation
          (and (> arg 0)
               (or (and (python-info-looking-at-beginning-of-defun nil t)
                        (+ (save-excursion
                             (python-nav-beginning-of-statement)
                             (current-indentation))
                           python-indent-offset))
                   (save-excursion
                     (while
                         (and
                          (python-nav-backward-block)
                          (or (not (python-info-looking-at-beginning-of-defun))
                              (>= (current-indentation) min-indentation))
                          (setq min-indentation
                                (min min-indentation (current-indentation)))))
                     (or (and (python-info-looking-at-beginning-of-defun)
                              (+ (current-indentation) python-indent-offset))
                         0)))))
         (found
          (progn
            (when (and (python-info-looking-at-beginning-of-defun nil t)
                       (or (< arg 0)
                           ;; If looking at beginning of defun, and if
                           ;; pos is > line-content-start, ensure a
                           ;; backward re search match this defun by
                           ;; going to end of line before calling
                           ;; re-search-fn bug#40563
                           (and (> arg 0)
                                (or (python-info-continuation-line-p)
                                    (> pos line-content-start)))))
              (python-nav-end-of-statement))

            (while (and (funcall re-search-fn
                                 python-nav-beginning-of-defun-regexp nil t)
                        (or (python-syntax-context-type)
                            ;; Handle nested defuns when moving
                            ;; backwards by checking indentation.
                            (and (> arg 0)
                                 (not (= (current-indentation) 0))
                                 (>= (current-indentation) body-indentation)))))
            (and (python-info-looking-at-beginning-of-defun nil t)
                 (or (not (= (line-number-at-pos pos)
                             (line-number-at-pos)))
                     (and (>= (point) line-beg-pos)
                          (<= (point) line-content-start)
                          (> pos line-content-start)))))))
    (if found
        (progn
          (when (< arg 0)
            (python-nav-beginning-of-statement))
          (beginning-of-line 1)
          t)
      (and (goto-char pos) nil))))

(defun python-nav-beginning-of-defun (&optional arg)
  "Move point to `beginning-of-defun'.
With positive ARG search backwards else search forward.
ARG nil or 0 defaults to 1.  When searching backwards,
nested defuns are handled with care depending on current
point position.  Return non-nil if point is moved to
`beginning-of-defun'."
  (when (or (null arg) (= arg 0)) (setq arg 1))
  (let ((found))
    (while (and (not (= arg 0))
                (let ((keep-searching-p
                       (python-nav--beginning-of-defun arg)))
                  (when (and keep-searching-p (null found))
                    (setq found t))
                  keep-searching-p))
      (setq arg (if (> arg 0) (1- arg) (1+ arg))))
    found))

(defun python-nav-end-of-defun ()
  "Move point to the end of def or class.
Returns nil if point is not in a def or class."
  (interactive)
  (let ((beg-defun-indent)
        (beg-pos (point)))
    (when (or (python-info-looking-at-beginning-of-defun)
              (python-nav-beginning-of-defun 1)
              (python-nav-beginning-of-defun -1))
      (setq beg-defun-indent (current-indentation))
      (while (progn
               (python-nav-end-of-statement)
               (python-util-forward-comment 1)
               (and (> (current-indentation) beg-defun-indent)
                    (not (eobp)))))
      (python-util-forward-comment -1)
      (forward-line 1)
      ;; Ensure point moves forward.
      (and (> beg-pos (point)) (goto-char beg-pos))
      ;; Return non-nil if we did something (because then we were in a
      ;; def/class).
      (/= beg-pos (point)))))

(defun python-nav--syntactically (fn poscompfn &optional contextfn)
  "Move point using FN avoiding places with specific context.
FN must take no arguments.  POSCOMPFN is a two arguments function
used to compare current and previous point after it is moved
using FN, this is normally a less-than or greater-than
comparison.  Optional argument CONTEXTFN defaults to
`python-syntax-context-type' and is used for checking current
point context, it must return a non-nil value if this point must
be skipped."
  (let ((contextfn (or contextfn 'python-syntax-context-type))
        (start-pos (point-marker))
        (prev-pos))
    (catch 'found
      (while t
        (let* ((newpos
                (and (funcall fn) (point-marker)))
               (context (funcall contextfn)))
          (cond ((and (not context) newpos
                      (or (and (not prev-pos) newpos)
                          (and prev-pos newpos
                               (funcall poscompfn newpos prev-pos))))
                 (throw 'found (point-marker)))
                ((and newpos context)
                 (setq prev-pos (point)))
                (t (when (not newpos) (goto-char start-pos))
                   (throw 'found nil))))))))

(defun python-nav--forward-defun (arg)
  "Internal implementation of python-nav-{backward,forward}-defun.
Uses ARG to define which function to call, and how many times
repeat it."
  (let ((found))
    (while (and (> arg 0)
                (setq found
                      (python-nav--syntactically
                       (lambda ()
                         (re-search-forward
                          python-nav-beginning-of-defun-regexp nil t))
                       '>)))
      (setq arg (1- arg)))
    (while (and (< arg 0)
                (setq found
                      (python-nav--syntactically
                       (lambda ()
                         (re-search-backward
                          python-nav-beginning-of-defun-regexp nil t))
                       '<)))
      (setq arg (1+ arg)))
    found))

(defun python-nav-backward-defun (&optional arg)
  "Navigate to closer defun backward ARG times.
Unlikely `python-nav-beginning-of-defun' this doesn't care about
nested definitions."
  (interactive "^p")
  (python-nav--forward-defun (- (or arg 1))))

(defun python-nav-forward-defun (&optional arg)
  "Navigate to closer defun forward ARG times.
Unlikely `python-nav-beginning-of-defun' this doesn't care about
nested definitions."
  (interactive "^p")
  (python-nav--forward-defun (or arg 1)))

(defun python-nav-beginning-of-statement ()
  "Move to start of current statement."
  (interactive "^")
  (forward-line 0)
  (let* ((ppss (syntax-ppss))
         (context-point
          (or
           (python-syntax-context 'paren ppss)
           (python-syntax-context 'string ppss))))
    (cond ((bobp))
          (context-point
           (goto-char context-point)
           (python-nav-beginning-of-statement))
          ((save-excursion
             (forward-line -1)
             (python-info-line-ends-backslash-p))
           (forward-line -1)
           (python-nav-beginning-of-statement))))
  (back-to-indentation)
  (point-marker))

(defun python-nav-end-of-statement (&optional noend)
  "Move to end of current statement.
Optional argument NOEND is internal and makes the logic to not
jump to the end of line when moving forward searching for the end
of the statement."
  (interactive "^")
  (let (string-start bs-pos (last-string-end 0))
    (while (and (or noend (goto-char (line-end-position)))
                (not (eobp))
                (cond ((setq string-start (python-syntax-context 'string))
                       ;; The condition can be nil if syntax table
                       ;; text properties and the `syntax-ppss' cache
                       ;; are somehow out of whack.  This has been
                       ;; observed when using `syntax-ppss' during
                       ;; narrowing.
                       ;; It can also fail in cases where the buffer is in
                       ;; the process of being modified, e.g. when creating
                       ;; a string with `electric-pair-mode' disabled such
                       ;; that there can be an unmatched single quote
                       (when (>= string-start last-string-end)
                         (goto-char string-start)
                         (if (python-syntax-context 'paren)
                             ;; Ended up inside a paren, roll again.
                             (python-nav-end-of-statement t)
                           ;; This is not inside a paren, move to the
                           ;; end of this string.
                           (goto-char (+ (point)
                                         (python-syntax-count-quotes
                                          (char-after (point)) (point))))
                           (setq last-string-end
                                 (or (re-search-forward
                                      (rx (syntax string-delimiter)) nil t)
                                     (goto-char (point-max)))))))
                      ((python-syntax-context 'paren)
                       ;; The statement won't end before we've escaped
                       ;; at least one level of parenthesis.
                       (condition-case err
                           (goto-char (scan-lists (point) 1 -1))
                         (scan-error (goto-char (nth 3 err)))))
                      ((setq bs-pos (python-info-line-ends-backslash-p))
                       (goto-char bs-pos)
                       (forward-line 1))))))
  (point-marker))

(defun python-nav-backward-statement (&optional arg)
  "Move backward to previous statement.
With ARG, repeat.  See `python-nav-forward-statement'."
  (interactive "^p")
  (or arg (setq arg 1))
  (python-nav-forward-statement (- arg)))

(defun python-nav-forward-statement (&optional arg)
  "Move forward to next statement.
With ARG, repeat.  With negative argument, move ARG times
backward to previous statement."
  (interactive "^p")
  (or arg (setq arg 1))
  (while (> arg 0)
    (python-nav-end-of-statement)
    (python-util-forward-comment)
    (python-nav-beginning-of-statement)
    (setq arg (1- arg)))
  (while (< arg 0)
    (python-nav-beginning-of-statement)
    (python-util-forward-comment -1)
    (python-nav-beginning-of-statement)
    (setq arg (1+ arg))))

(defun python-nav-beginning-of-block ()
  "Move to start of current block."
  (interactive "^")
  (let ((starting-pos (point)))
    (if (progn
          (python-nav-beginning-of-statement)
          (looking-at (python-rx block-start)))
        (point-marker)
      ;; Go to first line beginning a statement
      (while (and (not (bobp))
                  (or (and (python-nav-beginning-of-statement) nil)
                      (python-info-current-line-comment-p)
                      (python-info-current-line-empty-p)))
        (forward-line -1))
      (let ((block-matching-indent
             (- (current-indentation) python-indent-offset)))
        (while
            (and (python-nav-backward-block)
                 (> (current-indentation) block-matching-indent)))
        (if (and (looking-at (python-rx block-start))
                 (= (current-indentation) block-matching-indent))
            (point-marker)
          (and (goto-char starting-pos) nil))))))

(defun python-nav-end-of-block ()
  "Move to end of current block."
  (interactive "^")
  (when (python-nav-beginning-of-block)
    (let ((block-indentation (current-indentation)))
      (python-nav-end-of-statement)
      (while (and (forward-line 1)
                  (not (eobp))
                  (or (and (> (current-indentation) block-indentation)
                           (let ((start (point)))
                             (python-nav-end-of-statement)
                             ;; must move forward otherwise infinite loop
                             (> (point) start)))
                      (python-info-current-line-comment-p)
                      (python-info-current-line-empty-p))))
      (python-util-forward-comment -1)
      (point-marker))))

(defun python-nav-backward-block (&optional arg)
  "Move backward to previous block of code.
With ARG, repeat.  See `python-nav-forward-block'."
  (interactive "^p")
  (or arg (setq arg 1))
  (python-nav-forward-block (- arg)))

(defun python-nav-forward-block (&optional arg)
  "Move forward to next block of code.
With ARG, repeat.  With negative argument, move ARG times
backward to previous block."
  (interactive "^p")
  (or arg (setq arg 1))
  (let ((block-start-regexp
         (python-rx line-start (* whitespace) block-start))
        (starting-pos (point)))
    (while (> arg 0)
      (python-nav-end-of-statement)
      (while (and
              (re-search-forward block-start-regexp nil t)
              (python-syntax-context-type)))
      (setq arg (1- arg)))
    (while (< arg 0)
      (python-nav-beginning-of-statement)
      (while (and
              (re-search-backward block-start-regexp nil t)
              (python-syntax-context-type)))
      (setq arg (1+ arg)))
    (python-nav-beginning-of-statement)
    (if (not (looking-at (python-rx block-start)))
        (and (goto-char starting-pos) nil)
      (and (not (= (point) starting-pos)) (point-marker)))))

(defun python-nav--lisp-forward-sexp (&optional arg)
  "Standard version `forward-sexp'.
It ignores completely the value of `forward-sexp-function' by
setting it to nil before calling `forward-sexp'.  With positive
ARG move forward only one sexp, else move backwards."
  (let ((forward-sexp-function)
        (arg (if (or (not arg) (> arg 0)) 1 -1)))
    (forward-sexp arg)))

(defun python-nav--lisp-forward-sexp-safe (&optional arg)
  "Safe version of standard `forward-sexp'.
When at end of sexp (i.e. looking at an opening/closing paren)
skips it instead of throwing an error.  With positive ARG move
forward only one sexp, else move backwards."
  (let* ((arg (if (or (not arg) (> arg 0)) 1 -1))
         (paren-regexp
          (if (> arg 0) (python-rx close-paren) (python-rx open-paren)))
         (search-fn
          (if (> arg 0) #'re-search-forward #'re-search-backward)))
    (condition-case nil
        (python-nav--lisp-forward-sexp arg)
      (error
       (while (and (funcall search-fn paren-regexp nil t)
                   (python-syntax-context 'paren)))))))

(defun python-nav--forward-sexp (&optional dir safe skip-parens-p)
  "Move to forward sexp.
With positive optional argument DIR direction move forward, else
backwards.  When optional argument SAFE is non-nil do not throw
errors when at end of sexp, skip it instead.  With optional
argument SKIP-PARENS-P force sexp motion to ignore parenthesized
expressions when looking at them in either direction."
  (setq dir (or dir 1))
  (unless (= dir 0)
    (let* ((forward-p (if (> dir 0)
                          (and (setq dir 1) t)
                        (and (setq dir -1) nil)))
           (context-type (python-syntax-context-type)))
      (cond
       ((memq context-type '(string comment))
        ;; Inside of a string, get out of it.
        (let ((forward-sexp-function))
          (forward-sexp dir)))
       ((and (not skip-parens-p)
             (or (eq context-type 'paren)
                 (if forward-p
                     (eq (syntax-class (syntax-after (point)))
                         (car (string-to-syntax "(")))
                   (eq (syntax-class (syntax-after (1- (point))))
                       (car (string-to-syntax ")"))))))
        ;; Inside a paren or looking at it, lisp knows what to do.
        (if safe
            (python-nav--lisp-forward-sexp-safe dir)
          (python-nav--lisp-forward-sexp dir)))
       (t
        ;; This part handles the lispy feel of
        ;; `python-nav-forward-sexp'.  Knowing everything about the
        ;; current context and the context of the next sexp tries to
        ;; follow the lisp sexp motion commands in a symmetric manner.
        (let* ((context
                (cond
                 ((python-info-beginning-of-block-p) 'block-start)
                 ((python-info-end-of-block-p) 'block-end)
                 ((python-info-beginning-of-statement-p) 'statement-start)
                 ((python-info-end-of-statement-p) 'statement-end)))
               (next-sexp-pos
                (save-excursion
                  (if safe
                      (python-nav--lisp-forward-sexp-safe dir)
                    (python-nav--lisp-forward-sexp dir))
                  (point)))
               (next-sexp-context
                (save-excursion
                  (goto-char next-sexp-pos)
                  (cond
                   ((python-info-beginning-of-block-p) 'block-start)
                   ((python-info-end-of-block-p) 'block-end)
                   ((python-info-beginning-of-statement-p) 'statement-start)
                   ((python-info-end-of-statement-p) 'statement-end)
                   ((python-info-statement-starts-block-p) 'starts-block)
                   ((python-info-statement-ends-block-p) 'ends-block)))))
          (if forward-p
              (cond ((and (not (eobp))
                          (python-info-current-line-empty-p))
                     (python-util-forward-comment dir)
                     (python-nav--forward-sexp dir safe skip-parens-p))
                    ((eq context 'block-start)
                     (python-nav-end-of-block))
                    ((eq context 'statement-start)
                     (python-nav-end-of-statement))
                    ((and (memq context '(statement-end block-end))
                          (eq next-sexp-context 'ends-block))
                     (goto-char next-sexp-pos)
                     (python-nav-end-of-block))
                    ((and (memq context '(statement-end block-end))
                          (eq next-sexp-context 'starts-block))
                     (goto-char next-sexp-pos)
                     (python-nav-end-of-block))
                    ((memq context '(statement-end block-end))
                     (goto-char next-sexp-pos)
                     (python-nav-end-of-statement))
                    (t (goto-char next-sexp-pos)))
            (cond ((and (not (bobp))
                        (python-info-current-line-empty-p))
                   (python-util-forward-comment dir)
                   (python-nav--forward-sexp dir safe skip-parens-p))
                  ((eq context 'block-end)
                   (python-nav-beginning-of-block))
                  ((eq context 'statement-end)
                   (python-nav-beginning-of-statement))
                  ((and (memq context '(statement-start block-start))
                        (eq next-sexp-context 'starts-block))
                   (goto-char next-sexp-pos)
                   (python-nav-beginning-of-block))
                  ((and (memq context '(statement-start block-start))
                        (eq next-sexp-context 'ends-block))
                   (goto-char next-sexp-pos)
                   (python-nav-beginning-of-block))
                  ((memq context '(statement-start block-start))
                   (goto-char next-sexp-pos)
                   (python-nav-beginning-of-statement))
                  (t (goto-char next-sexp-pos))))))))))

(defun python-nav-forward-sexp (&optional arg safe skip-parens-p)
  "Move forward across expressions.
With ARG, do it that many times.  Negative arg -N means move
backward N times.  When optional argument SAFE is non-nil do not
throw errors when at end of sexp, skip it instead.  With optional
argument SKIP-PARENS-P force sexp motion to ignore parenthesized
expressions when looking at them in either direction (forced to t
in interactive calls)."
  (interactive "^p")
  (or arg (setq arg 1))
  ;; Do not follow parens on interactive calls.  This hack to detect
  ;; if the function was called interactively copes with the way
  ;; `forward-sexp' works by calling `forward-sexp-function', losing
  ;; interactive detection by checking `current-prefix-arg'.  The
  ;; reason to make this distinction is that lisp functions like
  ;; `blink-matching-open' get confused causing issues like the one in
  ;; Bug#16191.  With this approach the user gets a symmetric behavior
  ;; when working interactively while called functions expecting
  ;; paren-based sexp motion work just fine.
  (or
   skip-parens-p
   (setq skip-parens-p
         (memq real-this-command
               (list
                #'forward-sexp #'backward-sexp
                #'python-nav-forward-sexp #'python-nav-backward-sexp
                #'python-nav-forward-sexp-safe #'python-nav-backward-sexp))))
  (while (> arg 0)
    (python-nav--forward-sexp 1 safe skip-parens-p)
    (setq arg (1- arg)))
  (while (< arg 0)
    (python-nav--forward-sexp -1 safe skip-parens-p)
    (setq arg (1+ arg))))

(defun python-nav-backward-sexp (&optional arg safe skip-parens-p)
  "Move backward across expressions.
With ARG, do it that many times.  Negative arg -N means move
forward N times.  When optional argument SAFE is non-nil do not
throw errors when at end of sexp, skip it instead.  With optional
argument SKIP-PARENS-P force sexp motion to ignore parenthesized
expressions when looking at them in either direction (forced to t
in interactive calls)."
  (interactive "^p")
  (or arg (setq arg 1))
  (python-nav-forward-sexp (- arg) safe skip-parens-p))

(defun python-nav-forward-sexp-safe (&optional arg skip-parens-p)
  "Move forward safely across expressions.
With ARG, do it that many times.  Negative arg -N means move
backward N times.  With optional argument SKIP-PARENS-P force
sexp motion to ignore parenthesized expressions when looking at
them in either direction (forced to t in interactive calls)."
  (interactive "^p")
  (python-nav-forward-sexp arg t skip-parens-p))

(defun python-nav-backward-sexp-safe (&optional arg skip-parens-p)
  "Move backward safely across expressions.
With ARG, do it that many times.  Negative arg -N means move
forward N times.  With optional argument SKIP-PARENS-P force sexp
motion to ignore parenthesized expressions when looking at them in
either direction (forced to t in interactive calls)."
  (interactive "^p")
  (python-nav-backward-sexp arg t skip-parens-p))

(defun python-nav--up-list (&optional dir)
  "Internal implementation of `python-nav-up-list'.
DIR is always 1 or -1 and comes sanitized from
`python-nav-up-list' calls."
  (let ((context (python-syntax-context-type))
        (forward-p (> dir 0)))
    (cond
     ((memq context '(string comment)))
     ((eq context 'paren)
      (let ((forward-sexp-function))
        (up-list dir)))
     ((and forward-p (python-info-end-of-block-p))
      (let ((parent-end-pos
             (save-excursion
               (let ((indentation (and
                                   (python-nav-beginning-of-block)
                                   (current-indentation))))
                 (while (and indentation
                             (> indentation 0)
                             (>= (current-indentation) indentation)
                             (python-nav-backward-block)))
                 (python-nav-end-of-block)))))
        (and (> (or parent-end-pos (point)) (point))
             (goto-char parent-end-pos))))
     (forward-p (python-nav-end-of-block))
     ((and (not forward-p)
           (> (current-indentation) 0)
           (python-info-beginning-of-block-p))
      (let ((prev-block-pos
             (save-excursion
               (let ((indentation (current-indentation)))
                 (while (and (python-nav-backward-block)
                             (>= (current-indentation) indentation))))
               (point))))
        (and (> (point) prev-block-pos)
             (goto-char prev-block-pos))))
     ((not forward-p) (python-nav-beginning-of-block)))))

(defun python-nav-up-list (&optional arg)
  "Move forward out of one level of parentheses (or blocks).
With ARG, do this that many times.
A negative argument means move backward but still to a less deep spot.
This command assumes point is not in a string or comment."
  (interactive "^p")
  (or arg (setq arg 1))
  (while (> arg 0)
    (python-nav--up-list 1)
    (setq arg (1- arg)))
  (while (< arg 0)
    (python-nav--up-list -1)
    (setq arg (1+ arg))))

(defun python-nav-backward-up-list (&optional arg)
  "Move backward out of one level of parentheses (or blocks).
With ARG, do this that many times.
A negative argument means move forward but still to a less deep spot.
This command assumes point is not in a string or comment."
  (interactive "^p")
  (or arg (setq arg 1))
  (python-nav-up-list (- arg)))

(defun python-nav-if-name-main ()
  "Move point at the beginning the __main__ block.
When \"if __name__ == \\='__main__\\=':\" is found returns its
position, else returns nil."
  (interactive)
  (let ((point (point))
        (found (catch 'found
                 (goto-char (point-min))
                 (while (re-search-forward
                         (python-rx line-start
                                    "if" (+ space)
                                    "__name__" (+ space)
                                    "==" (+ space)
                                    (group-n 1 (or ?\" ?\'))
                                    "__main__" (backref 1) (* space) ":")
                         nil t)
                   (when (not (python-syntax-context-type))
                     (beginning-of-line)
                     (throw 'found t))))))
    (if found
        (point)
      (ignore (goto-char point)))))

\f
;;; Shell integration

(defcustom python-shell-buffer-name "Python"
  "Default buffer name for Python interpreter."
  :type 'string
  :safe 'stringp)

(defcustom python-shell-interpreter
  (cond ((executable-find "python3") "python3")
        ((executable-find "python") "python")
        (t "python3"))
  "Default Python interpreter for shell.

Some Python interpreters also require changes to
`python-shell-interpreter-args'.  In particular, setting
`python-shell-interpreter' to \"ipython3\" requires setting
`python-shell-interpreter-args' to \"--simple-prompt\"."
  :version "28.1"
  :type 'string)

(defcustom python-shell-internal-buffer-name "Python Internal"
  "Default buffer name for the Internal Python interpreter."
  :type 'string
  :safe 'stringp)

(defcustom python-shell-interpreter-args "-i"
  "Default arguments for the Python interpreter."
  :type 'string)

(defcustom python-shell-interpreter-interactive-arg "-i"
  "Interpreter argument to force it to run interactively."
  :type 'string
  :version "24.4")

(defcustom python-shell-prompt-detect-enabled t
  "Non-nil enables autodetection of interpreter prompts."
  :type 'boolean
  :safe 'booleanp
  :version "24.4")

(defcustom python-shell-prompt-detect-failure-warning t
  "Non-nil enables warnings when detection of prompts fail."
  :type 'boolean
  :safe 'booleanp
  :version "24.4")

(defcustom python-shell-prompt-input-regexps
  '(">>> " "\\.\\.\\. "                 ; Python
    "In \\[[0-9]+\\]: "                 ; IPython
    "   \\.\\.\\.: "                    ; IPython
    ;; Using ipdb outside IPython may fail to cleanup and leave static
    ;; IPython prompts activated, this adds some safeguard for that.
    "In : " "\\.\\.\\.: ")
  "List of regular expressions matching input prompts."
  :type '(repeat regexp)
  :version "24.4")

(defcustom python-shell-prompt-output-regexps
  '(""                                  ; Python
    "Out\\[[0-9]+\\]: "                 ; IPython
    "Out :")                            ; ipdb safeguard
  "List of regular expressions matching output prompts."
  :type '(repeat regexp)
  :version "24.4")

(defcustom python-shell-prompt-regexp ">>> "
  "Regular expression matching top level input prompt of Python shell.
It should not contain a caret (^) at the beginning."
  :type 'regexp)

(defcustom python-shell-prompt-block-regexp "\\.\\.\\.:? "
  "Regular expression matching block input prompt of Python shell.
It should not contain a caret (^) at the beginning."
  :type 'regexp)

(defcustom python-shell-prompt-output-regexp ""
  "Regular expression matching output prompt of Python shell.
It should not contain a caret (^) at the beginning."
  :type 'regexp)

(defcustom python-shell-prompt-pdb-regexp "[(<]*[Ii]?[Pp]db[>)]+ "
  "Regular expression matching pdb input prompt of Python shell.
It should not contain a caret (^) at the beginning."
  :type 'regexp)

(define-obsolete-variable-alias
  'python-shell-enable-font-lock 'python-shell-font-lock-enable "25.1")

(defcustom python-shell-font-lock-enable t
  "Should syntax highlighting be enabled in the Python shell buffer?
Restart the Python shell after changing this variable for it to take effect."
  :type 'boolean
  :safe 'booleanp)

(defcustom python-shell-unbuffered t
  "Should shell output be unbuffered?.
When non-nil, this may prevent delayed and missing output in the
Python shell.  See commentary for details."
  :type 'boolean
  :safe 'booleanp)

(defcustom python-shell-process-environment nil
  "List of overridden environment variables for subprocesses to inherit.
Each element should be a string of the form ENVVARNAME=VALUE.
When this variable is non-nil, values are exported into the
process environment before starting it.  Any variables already
present in the current environment are superseded by variables
set here."
  :type '(repeat string))

(defcustom python-shell-extra-pythonpaths nil
  "List of extra pythonpaths for Python shell.
When this variable is non-nil, values added at the beginning of
the PYTHONPATH before starting processes.  Any values present
here that already exists in PYTHONPATH are moved to the beginning
of the list so that they are prioritized when looking for
modules."
  :type '(repeat string))

(defcustom python-shell-exec-path nil
  "List of paths for searching executables.
When this variable is non-nil, values added at the beginning of
the PATH before starting processes.  Any values present here that
already exists in PATH are moved to the beginning of the list so
that they are prioritized when looking for executables."
  :type '(repeat string))

(defcustom python-shell-remote-exec-path nil
  "List of paths to be ensured remotely for searching executables.
When this variable is non-nil, values are exported into remote
hosts PATH before starting processes.  Values defined in
`python-shell-exec-path' will take precedence to paths defined
here.  Normally you won't use this variable directly unless you
plan to ensure a particular set of paths to all Python shell
executed through tramp connections."
  :version "25.1"
  :type '(repeat string))

(define-obsolete-variable-alias
  'python-shell-virtualenv-path 'python-shell-virtualenv-root "25.1")

(defcustom python-shell-virtualenv-root nil
  "Path to virtualenv root.
This variable, when set to a string, makes the environment to be
modified such that shells are started within the specified
virtualenv."
  :type '(choice (const nil) directory))

(defcustom python-shell-setup-codes nil
  "List of code run by `python-shell-send-setup-code'."
  :type '(repeat symbol))

(defcustom python-shell-compilation-regexp-alist
  `((,(rx line-start (1+ (any " \t")) "File \""
          (group (1+ (not (any "\"<")))) ; avoid `<stdin>' &c
          "\", line " (group (1+ digit)))
     1 2)
    (,(rx " in file " (group (1+ not-newline)) " on line "
          (group (1+ digit)))
     1 2)
    (,(rx line-start "> " (group (1+ (not (any "(\"<"))))
          "(" (group (1+ digit)) ")" (1+ (not (any "("))) "()")
     1 2))
  "`compilation-error-regexp-alist' for inferior Python."
  :type '(alist regexp))

(defcustom python-shell-dedicated nil
  "Whether to make Python shells dedicated by default.
This option influences `run-python' when called without a prefix
argument.  If `buffer' or `project', create a Python shell
dedicated to the current buffer or its project (if one is found)."
  :version "29.1"
  :type '(choice (const :tag "To buffer" buffer)
                 (const :tag "To project" project)
                 (const :tag "Not dedicated" nil)))

(defvar python-shell-output-filter-in-progress nil)
(defvar python-shell-output-filter-buffer nil)

(defmacro python-shell--add-to-path-with-priority (pathvar paths)
  "Modify PATHVAR and ensure PATHS are added only once at beginning."
  `(dolist (path (reverse ,paths))
     (cl-delete path ,pathvar :test #'string=)
     (cl-pushnew path ,pathvar :test #'string=)))

(defun python-shell-calculate-pythonpath ()
  "Calculate the PYTHONPATH using `python-shell-extra-pythonpaths'."
  (let ((pythonpath
         (split-string
          (or (getenv "PYTHONPATH") "") path-separator 'omit)))
    (python-shell--add-to-path-with-priority
     pythonpath python-shell-extra-pythonpaths)
    (mapconcat #'identity pythonpath path-separator)))

(defun python-shell-calculate-process-environment ()
  (declare (obsolete python-shell--calculate-process-environment "29.1"))
  (defvar tramp-remote-process-environment)
  (let* ((remote-p (file-remote-p default-directory)))
    (append (python-shell--calculate-process-environment)
            (if remote-p
                tramp-remote-process-environment
              process-environment))))

(defun python-shell--calculate-process-environment ()
  "Return a list of entries to add to the `process-environment'.
Prepends `python-shell-process-environment', sets extra
pythonpaths from `python-shell-extra-pythonpaths' and sets a few
virtualenv related vars."
  (let* ((virtualenv (when python-shell-virtualenv-root
                       (directory-file-name python-shell-virtualenv-root)))
         (res python-shell-process-environment))
    (when python-shell-unbuffered
      (push "PYTHONUNBUFFERED=1" res))
    (when python-shell-extra-pythonpaths
      (push (concat "PYTHONPATH=" (python-shell-calculate-pythonpath)) res))
    (if (not virtualenv)
        nil
      (push "PYTHONHOME" res)
      (push (concat "VIRTUAL_ENV=" virtualenv) res))
    res))

(defun python-shell-calculate-exec-path ()
  "Calculate `exec-path'.
Prepends `python-shell-exec-path' and adds the binary directory
for virtualenv if `python-shell-virtualenv-root' is set - this
will use the python interpreter from inside the virtualenv when
starting the shell.  If `default-directory' points to a remote host,
the returned value appends `python-shell-remote-exec-path' instead
of `exec-path'."
  (let ((new-path (copy-sequence
                   (if (file-remote-p default-directory)
                       python-shell-remote-exec-path
                     exec-path)))

        ;; Windows and POSIX systems use different venv directory structures
        (virtualenv-bin-dir (if (eq system-type 'windows-nt) "Scripts" "bin")))
    (python-shell--add-to-path-with-priority
     new-path python-shell-exec-path)
    (if (not python-shell-virtualenv-root)
        new-path
      (python-shell--add-to-path-with-priority
       new-path
       (list (expand-file-name virtualenv-bin-dir python-shell-virtualenv-root)))
      new-path)))

(defun python-shell-tramp-refresh-remote-path (vec paths)
  "Update VEC's remote-path giving PATHS priority."
  (cl-assert (featurep 'tramp))
  (declare-function tramp-set-remote-path "tramp-sh")
  (declare-function tramp-set-connection-property "tramp-cache")
  (declare-function tramp-get-connection-property "tramp-cache")
  (let ((remote-path (tramp-get-connection-property vec "remote-path" nil)))
    (when remote-path
      ;; FIXME: This part of the Tramp code still knows about Python!
      (python-shell--add-to-path-with-priority remote-path paths)
      (tramp-set-connection-property vec "remote-path" remote-path)
      (tramp-set-remote-path vec))))


(defun python-shell-tramp-refresh-process-environment (vec env)
  "Update VEC's process environment with ENV."
  (cl-assert (featurep 'tramp))
  (defvar tramp-end-of-heredoc)
  (defvar tramp-end-of-output)
  ;; Do we even know that `tramp-sh' is loaded at this point?
  ;; What about files accessed via FTP, sudo, ...?
  (declare-function tramp-send-command "tramp-sh")
  ;; Stolen from `tramp-open-connection-setup-interactive-shell'.
  (let ((env (append (when (fboundp 'tramp-get-remote-locale)
                       ;; Emacs<24.4 compat.
                       (list (tramp-get-remote-locale vec)))
		     (copy-sequence env)))
        (tramp-end-of-heredoc
         (if (boundp 'tramp-end-of-heredoc)
             tramp-end-of-heredoc
           (md5 tramp-end-of-output)))
	unset vars item)
    (while env
      (setq item (split-string (car env) "=" 'omit))
      (setcdr item (mapconcat #'identity (cdr item) "="))
      (if (and (stringp (cdr item)) (not (string-equal (cdr item) "")))
	  (push (format "%s %s" (car item) (cdr item)) vars)
	(push (car item) unset))
      (setq env (cdr env)))
    (when vars
      (tramp-send-command
       vec
       (format "while read var val; do export $var=$val; done <<'%s'\n%s\n%s"
	       tramp-end-of-heredoc
	       (mapconcat #'identity vars "\n")
	       tramp-end-of-heredoc)
       t))
    (when unset
      (tramp-send-command
       vec (format "unset %s" (mapconcat #'identity unset " ")) t))))

(defmacro python-shell-with-environment (&rest body)
  "Modify shell environment during execution of BODY.
Temporarily sets `process-environment' and `exec-path' during
execution of body.  If `default-directory' points to a remote
machine then modifies `tramp-remote-process-environment' and
`python-shell-remote-exec-path' instead."
  (declare (indent 0) (debug (body)))
  `(python-shell--with-environment
    (python-shell--calculate-process-environment)
    (lambda () ,@body)))

(defun python-shell--with-environment (extraenv bodyfun)
  ;; FIXME: This is where the generic code delegates to Tramp.
  (let* ((vec
          (and (file-remote-p default-directory)
               (fboundp 'tramp-dissect-file-name)
               (ignore-errors
                 (tramp-dissect-file-name default-directory 'noexpand)))))
    (if vec
        (python-shell--tramp-with-environment vec extraenv bodyfun)
      (let ((process-environment
             (append extraenv process-environment))
            (exec-path
             ;; FIXME: This is still Python-specific.
             (python-shell-calculate-exec-path)))
        (funcall bodyfun)))))

(defun python-shell--tramp-with-environment (vec extraenv bodyfun)
  (defvar tramp-remote-process-environment)
  (declare-function tramp-get-connection-process "tramp" (vec))
  (let* ((tramp-remote-process-environment
          (append extraenv tramp-remote-process-environment)))
    (when (tramp-get-connection-process vec)
      ;; For already existing connections, the new exec path must
      ;; be re-set, otherwise it won't take effect.  One example
      ;; of such case is when remote dir-locals are read and
      ;; *then* subprocesses are triggered within the same
      ;; connection.
      (python-shell-tramp-refresh-remote-path
       ;; FIXME: This is still Python-specific.
       vec (python-shell-calculate-exec-path))
      ;; The `tramp-remote-process-environment' variable is only
      ;; effective when the started process is an interactive
      ;; shell, otherwise (like in the case of processes started
      ;; with `process-file') the environment is not changed.
      ;; This makes environment modifications effective
      ;; unconditionally.
      (python-shell-tramp-refresh-process-environment
       vec tramp-remote-process-environment))
    (funcall bodyfun)))

(defvar python-shell--prompt-calculated-input-regexp nil
  "Calculated input prompt regexp for inferior python shell.
Do not set this variable directly, instead use
`python-shell-prompt-set-calculated-regexps'.")

(defvar python-shell--block-prompt nil
  "Input block prompt for inferior python shell.
Do not set this variable directly, instead use
`python-shell-prompt-set-calculated-regexps'.")

(defvar python-shell--prompt-calculated-output-regexp nil
  "Calculated output prompt regexp for inferior python shell.
Do not set this variable directly, instead use
`python-shell-prompt-set-calculated-regexps'.")

(defalias 'python--parse-json-array
  (if (fboundp 'json-parse-string)
      (lambda (string)
        (json-parse-string string :array-type 'list))
    (require 'json)
    (defvar json-array-type)
    (declare-function json-read-from-string "json" (string))
    (lambda (string)
      (let ((json-array-type 'list))
        (json-read-from-string string))))
  "Parse the JSON array in STRING into a Lisp list.")

(defun python-shell-prompt-detect ()
  "Detect prompts for the current `python-shell-interpreter'.
When prompts can be retrieved successfully from the
`python-shell-interpreter' run with
`python-shell-interpreter-interactive-arg', returns a list of
three elements, where the first two are input prompts and the
last one is an output prompt.  When no prompts can be detected
and `python-shell-prompt-detect-failure-warning' is non-nil,
shows a warning with instructions to avoid hangs and returns nil.
When `python-shell-prompt-detect-enabled' is nil avoids any
detection and just returns nil."
  (when python-shell-prompt-detect-enabled
    (python-shell-with-environment
      (let* ((code (concat
                    "import sys\n"
                    "ps = [getattr(sys, 'ps%s' % i, '') for i in range(1,4)]\n"
                    ;; JSON is built manually for compatibility
                    "ps_json = '\\n[\"%s\", \"%s\", \"%s\"]\\n' % tuple(ps)\n"
                    "print (ps_json)\n"
                    "sys.exit(0)\n"))
             (interpreter python-shell-interpreter)
             (interpreter-arg python-shell-interpreter-interactive-arg)
             (output
              (with-temp-buffer
                ;; TODO: improve error handling by using
                ;; `condition-case' and displaying the error message to
                ;; the user in the no-prompts warning.
                (ignore-errors
                  (let ((code-file
                         ;; Python 2.x on Windows does not handle
                         ;; carriage returns in unbuffered mode.
                         (let ((inhibit-eol-conversion (getenv "PYTHONUNBUFFERED")))
                           (python-shell--save-temp-file code))))
                    (unwind-protect
                        ;; Use `process-file' as it is remote-host friendly.
                        (process-file
                         interpreter
                         code-file
                         '(t nil)
                         nil
                         interpreter-arg)
                      ;; Try to cleanup
                      (delete-file code-file))))
                (buffer-string)))
             (prompts
              (catch 'prompts
                (dolist (line (split-string output "\n" t))
                  (let ((res
                         ;; Check if current line is a valid JSON array.
                         (and (string-prefix-p "[\"" line)
                              (ignore-errors
                                ;; Return prompts as a list.
                                (python--parse-json-array line)))))
                    ;; The list must contain 3 strings, where the first
                    ;; is the input prompt, the second is the block
                    ;; prompt and the last one is the output prompt.  The
                    ;; input prompt is the only one that can't be empty.
                    (when (and (= (length res) 3)
                               (cl-every #'stringp res)
                               (not (string= (car res) "")))
                      (throw 'prompts res))))
                nil)))
        (when (and (not prompts)
                   python-shell-prompt-detect-failure-warning)
          (lwarn
           '(python python-shell-prompt-regexp)
           :warning
           (concat
            "Python shell prompts cannot be detected.\n"
            "If your emacs session hangs when starting python shells\n"
            "recover with `keyboard-quit' and then try fixing the\n"
            "interactive flag for your interpreter by adjusting the\n"
            "`python-shell-interpreter-interactive-arg' or add regexps\n"
            "matching shell prompts in the directory-local friendly vars:\n"
            "  + `python-shell-prompt-regexp'\n"
            "  + `python-shell-prompt-block-regexp'\n"
            "  + `python-shell-prompt-output-regexp'\n"
            "Or alternatively in:\n"
            "  + `python-shell-prompt-input-regexps'\n"
            "  + `python-shell-prompt-output-regexps'")))
        prompts))))

(defun python-shell-prompt-validate-regexps ()
  "Validate all user provided regexps for prompts.
Signals `user-error' if any of these vars contain invalid
regexps: `python-shell-prompt-regexp',
`python-shell-prompt-block-regexp',
`python-shell-prompt-pdb-regexp',
`python-shell-prompt-output-regexp',
`python-shell-prompt-input-regexps',
`python-shell-prompt-output-regexps'."
  (dolist (symbol (list 'python-shell-prompt-input-regexps
                        'python-shell-prompt-output-regexps
                        'python-shell-prompt-regexp
                        'python-shell-prompt-block-regexp
                        'python-shell-prompt-pdb-regexp
                        'python-shell-prompt-output-regexp))
    (dolist (regexp (let ((regexps (symbol-value symbol)))
                      (if (listp regexps)
                          regexps
                        (list regexps))))
      (when (not (python-util-valid-regexp-p regexp))
        (user-error "Invalid regexp %s in `%s'"
                    regexp symbol)))))

(defun python-shell-prompt-set-calculated-regexps ()
  "Detect and set input and output prompt regexps.
Build and set the values for
`python-shell--prompt-calculated-input-regexp' and
`python-shell--prompt-calculated-output-regexp' using the values
from `python-shell-prompt-regexp',
`python-shell-prompt-block-regexp',
`python-shell-prompt-pdb-regexp',
`python-shell-prompt-output-regexp',
`python-shell-prompt-input-regexps',
`python-shell-prompt-output-regexps' and detected prompts from
`python-shell-prompt-detect'."
  (when (not (and python-shell--prompt-calculated-input-regexp
                  python-shell--prompt-calculated-output-regexp))
    (let* ((detected-prompts (python-shell-prompt-detect))
           (input-prompts nil)
           (output-prompts nil)
           (build-regexp
            (lambda (prompts)
              (concat "^\\("
                      (mapconcat #'identity
                                 (sort prompts
                                       (lambda (a b)
                                         (let ((length-a (length a))
                                               (length-b (length b)))
                                           (if (= length-a length-b)
                                               (string< a b)
                                             (> (length a) (length b))))))
                                 "\\|")
                      "\\)"))))
      ;; Validate ALL regexps
      (python-shell-prompt-validate-regexps)
      ;; Collect all user defined input prompts
      (dolist (prompt (append python-shell-prompt-input-regexps
                              (list python-shell-prompt-regexp
                                    python-shell-prompt-block-regexp
                                    python-shell-prompt-pdb-regexp)))
        (cl-pushnew prompt input-prompts :test #'string=))
      ;; Collect all user defined output prompts
      (dolist (prompt (cons python-shell-prompt-output-regexp
                            python-shell-prompt-output-regexps))
        (cl-pushnew prompt output-prompts :test #'string=))
      ;; Collect detected prompts if any
      (when detected-prompts
        (dolist (prompt (butlast detected-prompts))
          (setq prompt (regexp-quote prompt))
          (cl-pushnew prompt input-prompts :test #'string=))
        (setq python-shell--block-prompt (nth 1 detected-prompts))
        (cl-pushnew (regexp-quote
                     (car (last detected-prompts)))
                    output-prompts :test #'string=))
      ;; Set input and output prompt regexps from collected prompts
      (setq python-shell--prompt-calculated-input-regexp
            (funcall build-regexp input-prompts)
            python-shell--prompt-calculated-output-regexp
            (funcall build-regexp output-prompts)))))

(defun python-shell-get-process-name (dedicated)
  "Calculate the appropriate process name for inferior Python process.
If DEDICATED is nil, this is simply `python-shell-buffer-name'.
If DEDICATED is `buffer' or `project', append the current buffer
name respectively the current project name."
  (pcase dedicated
    ('nil python-shell-buffer-name)
    ('project
     (if-let ((proj (and (featurep 'project)
                         (project-current))))
         (format "%s[%s]" python-shell-buffer-name (file-name-nondirectory
                                                    (directory-file-name
                                                     (project-root proj))))
       python-shell-buffer-name))
    (_ (format "%s[%s]" python-shell-buffer-name (buffer-name)))))

(defun python-shell-internal-get-process-name ()
  "Calculate the appropriate process name for Internal Python process.
The name is calculated from `python-shell-buffer-name' and
the `buffer-name'."
  (format "%s[%s]" python-shell-internal-buffer-name (buffer-name)))

(defun python-shell-calculate-command ()
  "Calculate the string used to execute the inferior Python process."
  (format "%s %s"
          ;; `python-shell-make-comint' expects to be able to
          ;; `split-string-and-unquote' the result of this function.
          (combine-and-quote-strings (list python-shell-interpreter))
          python-shell-interpreter-args))

(define-obsolete-function-alias
  'python-shell-parse-command
  #'python-shell-calculate-command "25.1")

(defvar python-shell--package-depth 10)

(defun python-shell-package-enable (directory package)
  "Add DIRECTORY parent to $PYTHONPATH and enable PACKAGE."
  (interactive
   (let* ((dir (expand-file-name
                (read-directory-name
                 "Package root: "
                 (file-name-directory
                  (or (buffer-file-name) default-directory)))))
          (name (completing-read
                 "Package: "
                 (python-util-list-packages
                  dir python-shell--package-depth))))
     (list dir name)))
  (python-shell-send-string
   (format
    (concat
     "import os.path;import sys;"
     "sys.path.append(os.path.dirname(os.path.dirname(%s)));"
     "__package__ = %s;"
     "import %s")
    (python-shell--encode-string directory)
    (python-shell--encode-string package)
    package)
   (python-shell-get-process)))

(defun python-shell-accept-process-output (process &optional timeout regexp)
  "Accept PROCESS output with TIMEOUT until REGEXP is found.
Optional argument TIMEOUT is the timeout argument to
`accept-process-output' calls.  Optional argument REGEXP
overrides the regexp to match the end of output, defaults to
`comint-prompt-regexp'.  Returns non-nil when output was
properly captured.

This utility is useful in situations where the output may be
received in chunks, since `accept-process-output' gives no
guarantees they will be grabbed in a single call.  An example use
case for this would be the CPython shell start-up, where the
banner and the initial prompt are received separately."
  (let ((regexp (or regexp comint-prompt-regexp)))
    (catch 'found
      (while t
        (when (not (accept-process-output process timeout))
          (throw 'found nil))
        (when (looking-back
               regexp (car (python-util-comint-last-prompt)))
          (throw 'found t))))))

(defun python-shell-comint-end-of-output-p (output)
  "Return non-nil if OUTPUT ends with input prompt."
  (string-match
   ;; XXX: It seems on macOS an extra carriage return is attached
   ;; at the end of output, this handles that too.
   (concat
    "\r?\n?"
    ;; Remove initial caret from calculated regexp
    (replace-regexp-in-string
     (rx string-start ?^) ""
     python-shell--prompt-calculated-input-regexp)
    (rx eos))
   output))

(define-obsolete-function-alias
  'python-comint-output-filter-function
  #'ansi-color-filter-apply
  "25.1")

(defun python-comint-postoutput-scroll-to-bottom (output)
  "Faster version of `comint-postoutput-scroll-to-bottom'.
Avoids `recenter' calls until OUTPUT is completely sent."
  (declare (obsolete nil "29.1")) ; Not used.
  (when (and (not (string= "" output))
             (python-shell-comint-end-of-output-p
              (ansi-color-filter-apply output)))
    (comint-postoutput-scroll-to-bottom output))
  output)

(defvar python-shell--parent-buffer nil)

(defmacro python-shell-with-shell-buffer (&rest body)
  "Execute the forms in BODY with the shell buffer temporarily current.
Signals an error if no shell buffer is available for current buffer."
  (declare (indent 0) (debug t))
  (let ((shell-process (make-symbol "shell-process")))
    `(let ((,shell-process (python-shell-get-process-or-error)))
       (with-current-buffer (process-buffer ,shell-process)
         ,@body))))

(defvar python-shell--font-lock-buffer nil)

(defun python-shell-font-lock-get-or-create-buffer ()
  "Get or create a font-lock buffer for current inferior process."
  (python-shell-with-shell-buffer
    (if python-shell--font-lock-buffer
        python-shell--font-lock-buffer
      (let ((process-name
             (process-name (get-buffer-process (current-buffer)))))
        (generate-new-buffer
         (format " *%s-font-lock*" process-name))))))

(defun python-shell-font-lock-kill-buffer ()
  "Kill the font-lock buffer safely."
  (when (and python-shell--font-lock-buffer
             (buffer-live-p python-shell--font-lock-buffer))
    (kill-buffer python-shell--font-lock-buffer)
    (when (derived-mode-p 'inferior-python-mode)
      (setq python-shell--font-lock-buffer nil))))

(defmacro python-shell-font-lock-with-font-lock-buffer (&rest body)
  "Execute the forms in BODY in the font-lock buffer.
The value returned is the value of the last form in BODY.  See
also `with-current-buffer'."
  (declare (indent 0) (debug t))
  `(python-shell-with-shell-buffer
     (save-current-buffer
       (when (not (and python-shell--font-lock-buffer
                       (get-buffer python-shell--font-lock-buffer)))
         (setq python-shell--font-lock-buffer
               (python-shell-font-lock-get-or-create-buffer)))
       (set-buffer python-shell--font-lock-buffer)
       (when (not font-lock-mode)
         (font-lock-mode 1))
       (setq-local delay-mode-hooks t)
       (let ((python-indent-guess-indent-offset nil))
         (when (not (derived-mode-p 'python-mode))
           (python-mode))
         ,@body))))

(defun python-shell-font-lock-cleanup-buffer ()
  "Cleanup the font-lock buffer.
Provided as a command because this might be handy if something
goes wrong and syntax highlighting in the shell gets messed up."
  (interactive)
  (python-shell-with-shell-buffer
    (python-shell-font-lock-with-font-lock-buffer
      (erase-buffer))))

(defun python-shell-font-lock-comint-output-filter-function (output)
  "Clean up the font-lock buffer after any OUTPUT."
   (unless (string= output "") ;; See Bug#33959.
    (if (let ((output (ansi-color-filter-apply output)))
          (and (python-shell-comint-end-of-output-p output)
               ;; Assume "..." represents a continuation prompt.
               (not (string-match "\\.\\.\\." output))))
        ;; If output ends with an initial (not continuation) input prompt
        ;; then the font-lock buffer must be cleaned up.
        (python-shell-font-lock-cleanup-buffer)
      ;; Otherwise just add a newline.
      (python-shell-font-lock-with-font-lock-buffer
        (goto-char (point-max))
        (newline)))
    output))

(defun python-shell-font-lock-post-command-hook ()
  "Fontifies current line in shell buffer."
  (let ((prompt-end (cdr (python-util-comint-last-prompt))))
    (when (and prompt-end (> (point) prompt-end)
               (process-live-p (get-buffer-process (current-buffer))))
      (let* ((input (buffer-substring-no-properties
                     prompt-end (point-max)))
             (deactivate-mark nil)
             (start-pos prompt-end)
             (buffer-undo-list t)
             (replacement
              (python-shell-font-lock-with-font-lock-buffer
                (delete-region (point-min) (point-max))
                (insert input)
                (font-lock-ensure)
                (buffer-string)))
             (replacement-length (length replacement))
             (i 0))
        ;; Inject text properties to get input fontified.
        (while (not (= i replacement-length))
          (let* ((plist (text-properties-at i replacement))
                 (next-change (or (next-property-change i replacement)
                                  replacement-length))
                 (plist (let ((face (plist-get plist 'face)))
                          (if (not face)
                              plist
                            ;; Replace FACE text properties with
                            ;; FONT-LOCK-FACE so input is fontified.
                            (plist-put plist 'face nil)
                            (plist-put plist 'font-lock-face face)))))
            (set-text-properties
             (+ start-pos i) (+ start-pos next-change) plist)
            (setq i next-change)))))))

(defun python-shell-font-lock-turn-on (&optional msg)
  "Turn on shell font-lock.
With argument MSG show activation message."
  (interactive "p")
  (python-shell-with-shell-buffer
    (python-shell-font-lock-kill-buffer)
    (setq-local python-shell--font-lock-buffer nil)
    (add-hook 'post-command-hook
              #'python-shell-font-lock-post-command-hook nil 'local)
    (add-hook 'kill-buffer-hook
              #'python-shell-font-lock-kill-buffer nil 'local)
    (add-hook 'comint-output-filter-functions
              #'python-shell-font-lock-comint-output-filter-function
              'append 'local)
    (when msg
      (message "Shell font-lock is enabled"))))

(defun python-shell-font-lock-turn-off (&optional msg)
  "Turn off shell font-lock.
With argument MSG show deactivation message."
  (interactive "p")
  (python-shell-with-shell-buffer
    (python-shell-font-lock-kill-buffer)
    (when (python-util-comint-last-prompt)
      ;; Cleanup current fontification
      (remove-text-properties
       (cdr (python-util-comint-last-prompt))
       (line-end-position)
       '(face nil font-lock-face nil)))
    (setq-local python-shell--font-lock-buffer nil)
    (remove-hook 'post-command-hook
                 #'python-shell-font-lock-post-command-hook 'local)
    (remove-hook 'kill-buffer-hook
                 #'python-shell-font-lock-kill-buffer 'local)
    (remove-hook 'comint-output-filter-functions
                 #'python-shell-font-lock-comint-output-filter-function
                 'local)
    (when msg
      (message "Shell font-lock is disabled"))))

(defun python-shell-font-lock-toggle (&optional msg)
  "Toggle font-lock for shell.
With argument MSG show activation/deactivation message."
  (interactive "p")
  (python-shell-with-shell-buffer
    (setq-local python-shell-font-lock-enable
                (not python-shell-font-lock-enable))
    (if python-shell-font-lock-enable
        (python-shell-font-lock-turn-on msg)
      (python-shell-font-lock-turn-off msg))
    python-shell-font-lock-enable))

(defvar python-shell--first-prompt-received-output-buffer nil)
(defvar python-shell--first-prompt-received nil)

(defcustom python-shell-first-prompt-hook nil
  "Hook run upon first (non-pdb) shell prompt detection.
This is the place for shell setup functions that need to wait for
output.  Since the first prompt is ensured, this helps the
current process to not hang while waiting.  This is useful to
safely attach setup code for long-running processes that
eventually provide a shell."
  :version "25.1"
  :type 'hook)

(defconst python-shell-eval-setup-code
  "\
def __PYTHON_EL_eval(source, filename):
    import ast, sys
    if sys.version_info[0] == 2:
        from __builtin__ import compile, eval, globals
    else:
        from builtins import compile, eval, globals
    try:
        p, e = ast.parse(source, filename), None
    except SyntaxError:
        t, v, tb = sys.exc_info()
        sys.excepthook(t, v, tb.tb_next)
        return
    if p.body and isinstance(p.body[-1], ast.Expr):
        e = p.body.pop()
    try:
        g = globals()
        exec(compile(p, filename, 'exec'), g, g)
        if e:
            return eval(compile(ast.Expression(e.value), filename, 'eval'), g, g)
    except Exception:
        t, v, tb = sys.exc_info()
        sys.excepthook(t, v, tb.tb_next)"
  "Code used to evaluate statements in inferior Python processes.")

(defconst python-shell-eval-file-setup-code
  "\
def __PYTHON_EL_eval_file(filename, tempname, delete):
    import codecs, os, re
    pattern = r'^[ \t\f]*#.*?coding[:=][ \t]*([-_.a-zA-Z0-9]+)'
    with codecs.open(tempname or filename, encoding='latin-1') as file:
        match = re.match(pattern, file.readline())
        match = match or re.match(pattern, file.readline())
        encoding = match.group(1) if match else 'utf-8'
    with codecs.open(tempname or filename, encoding=encoding) as file:
        source = file.read().encode(encoding)
    if delete and tempname:
        os.remove(tempname)
    return __PYTHON_EL_eval(source, filename)"
  "Code used to evaluate files in inferior Python processes.
The coding cookie regexp is specified in PEP 263.")

(defun python-shell-comint-watch-for-first-prompt-output-filter (output)
  "Run `python-shell-first-prompt-hook' when first prompt is found in OUTPUT."
  (when (not python-shell--first-prompt-received)
    (setq-local python-shell--first-prompt-received-output-buffer
                (concat python-shell--first-prompt-received-output-buffer
                        (ansi-color-filter-apply output)))
    (when (python-shell-comint-end-of-output-p
           python-shell--first-prompt-received-output-buffer)
      (if (string-match-p
           (concat python-shell-prompt-pdb-regexp (rx eos))
           (or python-shell--first-prompt-received-output-buffer ""))
          ;; Skip pdb prompts and reset the buffer.
          (setq python-shell--first-prompt-received-output-buffer nil)
        (setq-local python-shell--first-prompt-received t)
        (setq python-shell--first-prompt-received-output-buffer nil)
        (cl-letf (((symbol-function 'python-shell-send-string)
                   (lambda (string process)
                     (comint-send-string
                      process
                      (format "exec(%s)\n" (python-shell--encode-string string))))))
          ;; Bootstrap: the normal definition of `python-shell-send-string'
          ;; depends on the Python code sent here.
          (python-shell-send-string-no-output python-shell-eval-setup-code)
          (python-shell-send-string-no-output python-shell-eval-file-setup-code))
        (with-current-buffer (current-buffer)
          (let ((inhibit-quit nil))
            (run-hooks 'python-shell-first-prompt-hook))))))
  output)

;; Used to hold user interactive overrides to
;; `python-shell-interpreter' and `python-shell-interpreter-args' that
;; will be made buffer-local by `inferior-python-mode':
(defvar python-shell--interpreter)
(defvar python-shell--interpreter-args)

(define-derived-mode inferior-python-mode comint-mode "Inferior Python"
  "Major mode for Python inferior process.
Runs a Python interpreter as a subprocess of Emacs, with Python
I/O through an Emacs buffer.  Variables `python-shell-interpreter'
and `python-shell-interpreter-args' control which Python
interpreter is run.  Variables
`python-shell-prompt-regexp',
`python-shell-prompt-output-regexp',
`python-shell-prompt-block-regexp',
`python-shell-font-lock-enable',
`python-shell-completion-setup-code',
`python-shell-completion-string-code',
`python-eldoc-setup-code', `python-eldoc-string-code',
`python-ffap-setup-code' and `python-ffap-string-code' can
customize this mode for different Python interpreters.

This mode resets `comint-output-filter-functions' locally, so you
may want to re-add custom functions to it using the
`inferior-python-mode-hook'.

You can also add additional setup code to be run at
initialization of the interpreter via `python-shell-setup-codes'
variable.

\(Type \\[describe-mode] in the process buffer for a list of commands.)"
  (when python-shell--parent-buffer
    (python-util-clone-local-variables python-shell--parent-buffer))
  (setq-local indent-tabs-mode nil)
  ;; Users can interactively override default values for
  ;; `python-shell-interpreter' and `python-shell-interpreter-args'
  ;; when calling `run-python'.  This ensures values let-bound in
  ;; `python-shell-make-comint' are locally set if needed.
  (setq-local python-shell-interpreter
              (or python-shell--interpreter python-shell-interpreter))
  (setq-local python-shell-interpreter-args
              (or python-shell--interpreter-args python-shell-interpreter-args))
  (setq-local python-shell--prompt-calculated-input-regexp nil)
  (setq-local python-shell--block-prompt nil)
  (setq-local python-shell--prompt-calculated-output-regexp nil)
  (python-shell-prompt-set-calculated-regexps)
  (setq comint-prompt-regexp python-shell--prompt-calculated-input-regexp)
  (setq-local comint-prompt-read-only t)
  (setq mode-line-process '(":%s"))
  (setq-local comint-output-filter-functions
              '(ansi-color-process-output
                python-shell-comint-watch-for-first-prompt-output-filter
                comint-watch-for-password-prompt))
  (setq-local comint-highlight-input nil)
  (setq-local compilation-error-regexp-alist
              python-shell-compilation-regexp-alist)
  (setq-local scroll-conservatively 1)
  (add-hook 'completion-at-point-functions
            #'python-shell-completion-at-point nil 'local)
  (define-key inferior-python-mode-map "\t"
    #'python-shell-completion-complete-or-indent)
  (make-local-variable 'python-shell-internal-last-output)
  (when python-shell-font-lock-enable
    (python-shell-font-lock-turn-on))
  (compilation-shell-minor-mode 1)
  (python-pdbtrack-setup-tracking))

(defun python-shell-make-comint (cmd proc-name &optional show internal)
  "Create a Python shell comint buffer.
CMD is the Python command to be executed and PROC-NAME is the
process name the comint buffer will get.  After the comint buffer
is created the `inferior-python-mode' is activated.  When
optional argument SHOW is non-nil the buffer is shown.  When
optional argument INTERNAL is non-nil this process is run on a
buffer with a name that starts with a space, following the Emacs
convention for temporary/internal buffers, and also makes sure
the user is not queried for confirmation when the process is
killed."
  (save-excursion
    (python-shell-with-environment
      (let* ((proc-buffer-name
              (format (if (not internal) "*%s*" " *%s*") proc-name)))
        (when (not (comint-check-proc proc-buffer-name))
          (let* ((cmdlist (split-string-and-unquote cmd))
                 (interpreter (car cmdlist))
                 (args (cdr cmdlist))
                 (buffer (apply #'make-comint-in-buffer proc-name
                                proc-buffer-name
                                interpreter nil args))
                 (python-shell--parent-buffer (current-buffer))
                 (process (get-buffer-process buffer))
                 ;; Users can override the interpreter and args
                 ;; interactively when calling `run-python', let-binding
                 ;; these allows having the new right values in all
                 ;; setup code that is done in `inferior-python-mode',
                 ;; which is important, especially for prompt detection.
                 (python-shell--interpreter interpreter)
                 (python-shell--interpreter-args
                  (mapconcat #'identity args " ")))
            (with-current-buffer buffer
              (inferior-python-mode))
            (and internal (set-process-query-on-exit-flag process nil))))
        (when show
          (pop-to-buffer proc-buffer-name))
        proc-buffer-name))))

;;;###autoload
(defun run-python (&optional cmd dedicated show)
  "Run an inferior Python process.

Argument CMD defaults to `python-shell-calculate-command' return
value.  When called interactively with `prefix-arg', it allows
the user to edit such value and choose whether the interpreter
should be DEDICATED to the current buffer or project.  When
numeric prefix arg is other than 0 or 4 do not SHOW.

For a given buffer and same values of DEDICATED, if a process is
already running for it, it will do nothing.  This means that if
the current buffer is using a global process, the user is still
able to switch it to use a dedicated one.

Runs the hook `inferior-python-mode-hook' after
`comint-mode-hook' is run.  (Type \\[describe-mode] in the
process buffer for a list of commands.)"
  (interactive
   (if current-prefix-arg
       (list
        (read-shell-command "Run Python: " (python-shell-calculate-command))
        (if (not (fboundp 'read-multiple-choice))
            (y-or-n-p "Make dedicated process? ")
          (alist-get (car (read-multiple-choice "Make dedicated process?"
                                                '((?b "to buffer")
                                                  (?p "to project")
                                                  (?n "no"))))
                     '((?b . buffer) (?p . project))))
        (= (prefix-numeric-value current-prefix-arg) 4))
     (list (python-shell-calculate-command)
           python-shell-dedicated
           t)))
  (let* ((project (and (eq 'project dedicated)
                       (featurep 'project)
                       (project-current t)))
         (default-directory (if project
                                (project-root project)
                              default-directory))
         (buffer (python-shell-make-comint
                  (or cmd (python-shell-calculate-command))
                  (python-shell-get-process-name dedicated)
                  show)))
    (get-buffer-process buffer)))

(defun run-python-internal ()
  "Run an inferior Internal Python process.
Input and output via buffer named after
`python-shell-internal-buffer-name' and what
`python-shell-internal-get-process-name' returns.

This new kind of shell is intended to be used for generic
communication related to defined configurations; the main
difference with global or dedicated shells is that these ones are
attached to a configuration, not a buffer.  This means that can
be used for example to retrieve the sys.path and other stuff,
without messing with user shells.  Note that
`python-shell-font-lock-enable' and `inferior-python-mode-hook'
are set to nil for these shells, so setup codes are not sent at
startup."
  (let ((python-shell-font-lock-enable nil)
        (inferior-python-mode-hook nil))
    (get-buffer-process
     (python-shell-make-comint
      (python-shell-calculate-command)
      (python-shell-internal-get-process-name) nil t))))

(defun python-shell-get-buffer ()
  "Return inferior Python buffer for current buffer.
If current buffer is in `inferior-python-mode', return it."
  (if (derived-mode-p 'inferior-python-mode)
      (current-buffer)
    (seq-some
     (lambda (dedicated)
       (let* ((proc-name (python-shell-get-process-name dedicated))
              (buffer-name (format "*%s*" proc-name)))
         (when (comint-check-proc buffer-name)
           buffer-name)))
     '(buffer project nil))))

(defun python-shell-get-process ()
  "Return inferior Python process for current buffer."
  (get-buffer-process (python-shell-get-buffer)))

(defun python-shell-get-process-or-error (&optional interactivep)
  "Return inferior Python process for current buffer or signal error.
When argument INTERACTIVEP is non-nil, use `user-error' instead
of `error' with a user-friendly message."
  (or (python-shell-get-process)
      (if interactivep
          (user-error
           (substitute-command-keys
            "Start a Python process first with \\`M-x run-python' or `%s'")
           ;; Get the binding.
           (key-description
            (where-is-internal
             #'run-python overriding-local-map t)))
        (error "No inferior Python process running"))))

(defun python-shell-get-or-create-process (&optional cmd dedicated show)
  "Get or create an inferior Python process for current buffer and return it.
Arguments CMD, DEDICATED and SHOW are those of `run-python' and
are used to start the shell.  If those arguments are not
provided, `run-python' is called interactively and the user will
be asked for their values."
  (let ((shell-process (python-shell-get-process)))
    (when (not shell-process)
      (if (not cmd)
          ;; XXX: Refactor code such that calling `run-python'
          ;; interactively is not needed anymore.
          (call-interactively 'run-python)
        (run-python cmd dedicated show)))
    (or shell-process (python-shell-get-process))))

(make-obsolete
 #'python-shell-get-or-create-process
 "Instead call `python-shell-get-process' and create one if returns nil."
 "25.1")

(define-obsolete-variable-alias
  'python-buffer 'python-shell-internal-buffer "24.3")

(defvar python-shell-internal-buffer nil
  "Current internal shell buffer for the current buffer.
This is really not necessary at all for the code to work but it's
there for compatibility with CEDET.")

(define-obsolete-variable-alias
  'python-preoutput-result 'python-shell-internal-last-output "24.3")

(defvar python-shell-internal-last-output nil
  "Last output captured by the internal shell.
This is really not necessary at all for the code to work but it's
there for compatibility with CEDET.")

(defun python-shell-internal-get-or-create-process ()
  "Get or create an inferior Internal Python process."
  (let ((proc-name (python-shell-internal-get-process-name)))
    (if (process-live-p proc-name)
        (get-process proc-name)
      (run-python-internal))))

(define-obsolete-function-alias
  'python-proc #'python-shell-internal-get-or-create-process "24.3")

(defun python-shell--save-temp-file (string)
  (let* ((temporary-file-directory
          (if (file-remote-p default-directory)
              (concat (file-remote-p default-directory) "/tmp")
            temporary-file-directory))
         (temp-file-name (make-temp-file "py"))
         (coding-system-for-write (python-info-encoding)))
    (with-temp-file temp-file-name
      (if (bufferp string)
          (insert-buffer-substring string)
        (insert string))
      (delete-trailing-whitespace))
    temp-file-name))

(defalias 'python-shell--encode-string
  (let ((fun (if (and (fboundp 'json-serialize)
                      (>= emacs-major-version 28))
                 'json-serialize
               (require 'json)
               'json-encode-string)))
    (lambda (text)
      (if (stringp text)
          (funcall fun text)
        (signal 'wrong-type-argument (list 'stringp text)))))
  "Encode TEXT as a valid Python string.")

(defun python-shell-send-string (string &optional process msg)
  "Send STRING to inferior Python PROCESS.
When optional argument MSG is non-nil, forces display of a
user-friendly message if there's no process running; defaults to
t when called interactively."
  (interactive
   (list (read-string "Python command: ") nil t))
  (let ((process (or process (python-shell-get-process-or-error msg)))
        (code (format "__PYTHON_EL_eval(%s, %s)\n"
                      (python-shell--encode-string string)
                      (python-shell--encode-string (or (buffer-file-name)
                                                       "<string>")))))
    (unless python-shell-output-filter-in-progress
      (with-current-buffer (process-buffer process)
        (save-excursion
          (goto-char (process-mark process))
          (insert-before-markers "\n"))))
    (if (or (null (process-tty-name process))
            (<= (string-bytes code)
                (or (bound-and-true-p comint-max-line-length)
                    1024))) ;; For Emacs < 28
        (comint-send-string process code)
      (let* ((temp-file-name (with-current-buffer (process-buffer process)
                               (python-shell--save-temp-file string)))
             (file-name (or (buffer-file-name) temp-file-name)))
        (python-shell-send-file file-name process temp-file-name t)))))

(defun python-shell-output-filter (string)
  "Filter used in `python-shell-send-string-no-output' to grab output.
STRING is the output received to this point from the process.
This filter saves received output from the process in
`python-shell-output-filter-buffer' and stops receiving it after
detecting a prompt at the end of the buffer."
  (setq
   string (ansi-color-filter-apply string)
   python-shell-output-filter-buffer
   (concat python-shell-output-filter-buffer string))
  (when (python-shell-comint-end-of-output-p
         python-shell-output-filter-buffer)
    ;; Output ends when `python-shell-output-filter-buffer' contains
    ;; the prompt attached at the end of it.
    (setq python-shell-output-filter-in-progress nil
          python-shell-output-filter-buffer
          (substring python-shell-output-filter-buffer
                     0 (match-beginning 0)))
    (when (string-match
           python-shell--prompt-calculated-output-regexp
           python-shell-output-filter-buffer)
      ;; Some shells, like IPython might append a prompt before the
      ;; output, clean that.
      (setq python-shell-output-filter-buffer
            (substring python-shell-output-filter-buffer (match-end 0)))))
  "")

(defun python-shell-send-string-no-output (string &optional process)
  "Send STRING to PROCESS and inhibit output.
Return the output."
  (or process (setq process (python-shell-get-process-or-error)))
  (cl-letf (((process-filter process)
             (lambda (_proc str)
               (with-current-buffer (process-buffer process)
                 (python-shell-output-filter str))))
            (python-shell-output-filter-in-progress t)
            (inhibit-quit t))
    (or
     (with-local-quit
       (python-shell-send-string string process)
       (while python-shell-output-filter-in-progress
         ;; `python-shell-output-filter' takes care of setting
         ;; `python-shell-output-filter-in-progress' to NIL after it
         ;; detects end of output.
         (accept-process-output process))
       (prog1
           python-shell-output-filter-buffer
         (setq python-shell-output-filter-buffer nil)))
     (with-current-buffer (process-buffer process)
       (comint-interrupt-subjob)))))

(defun python-shell-internal-send-string (string)
  "Send STRING to the Internal Python interpreter.
Returns the output.  See `python-shell-send-string-no-output'."
  ;; XXX Remove `python-shell-internal-last-output' once CEDET is
  ;; updated to support this new mode.
  (setq python-shell-internal-last-output
        (python-shell-send-string-no-output
         ;; Makes this function compatible with the old
         ;; python-send-receive. (At least for CEDET).
         (replace-regexp-in-string "_emacs_out +" "" string)
         (python-shell-internal-get-or-create-process))))

(define-obsolete-function-alias
  'python-send-receive #'python-shell-internal-send-string "24.3")

(define-obsolete-function-alias
  'python-send-string #'python-shell-internal-send-string "24.3")

(defun python-shell-buffer-substring (start end &optional nomain no-cookie)
  "Send buffer substring from START to END formatted for shell.
This is a wrapper over `buffer-substring' that takes care of
different transformations for the code sent to be evaluated in
the python shell:
  1. When optional argument NOMAIN is non-nil everything under an
     \"if __name__ == \\='__main__\\='\" block will be removed.
  2. When a subregion of the buffer is sent, it takes care of
     appending extra empty lines so tracebacks are correct.
  3. When the region sent is a substring of the current buffer, a
     coding cookie is added.
  4. Wraps indented regions under an \"if True:\" block so the
     interpreter evaluates them correctly."
  (let* ((start (save-excursion
                  ;; If we're at the start of the expression, and
                  ;; there's just blank space ahead of it, then expand
                  ;; the region to include the start of the line.
                  ;; This makes things work better with the rest of
                  ;; the data we're sending over.
                  (goto-char start)
                  (if (string-blank-p
                       (buffer-substring (line-beginning-position) start))
                      (line-beginning-position)
                    start)))
         (substring (buffer-substring-no-properties start end))
         (starts-at-point-min-p (save-restriction
                                  (widen)
                                  (= (point-min) start)))
         (encoding (python-info-encoding))
         (toplevel-p (zerop (save-excursion
                              (goto-char start)
                              (python-util-forward-comment 1)
                              (current-indentation))))
         (fillstr (cond (starts-at-point-min-p
                         nil)
                        ((not no-cookie)
                         (concat
                          (format "# -*- coding: %s -*-\n" encoding)
                          (make-string
                           ;; Subtract 2 because of the coding cookie.
                           (- (line-number-at-pos start) 2) ?\n)))
                        (t
                         (make-string (- (line-number-at-pos start) 1) ?\n)))))
    (with-temp-buffer
      (python-mode)
      (when fillstr
        (insert fillstr))
      (when (not toplevel-p)
        (forward-line -1)
        (insert "if True:\n")
        (delete-region (point) (line-end-position)))
      (insert substring)
      (when nomain
        (let* ((if-name-main-start-end
                (and nomain
                     (save-excursion
                       (when (python-nav-if-name-main)
                         (cons (point)
                               (progn (python-nav-forward-sexp-safe)
                                      ;; Include ending newline
                                      (forward-line 1)
                                      (point)))))))
               ;; Oh destructuring bind, how I miss you.
               (if-name-main-start (car if-name-main-start-end))
               (if-name-main-end (cdr if-name-main-start-end))
               (fillstr (make-string
                         (- (line-number-at-pos if-name-main-end)
                            (line-number-at-pos if-name-main-start)) ?\n)))
          (when if-name-main-start-end
            (goto-char if-name-main-start)
            (delete-region if-name-main-start if-name-main-end)
            (insert fillstr))))
      ;; Ensure there's only one coding cookie in the generated string.
      (goto-char (point-min))
      (when (looking-at-p (python-rx coding-cookie))
        (forward-line 1)
        (when (looking-at-p (python-rx coding-cookie))
          (delete-region
           (line-beginning-position) (line-end-position))))
      (buffer-substring-no-properties (point-min) (point-max)))))

(declare-function compilation-forget-errors "compile")

(defun python-shell-send-region (start end &optional send-main msg
                                       no-cookie)
  "Send the region delimited by START and END to inferior Python process.
When optional argument SEND-MAIN is non-nil, allow execution of
code inside blocks delimited by \"if __name__== \\='__main__\\=':\".
When called interactively SEND-MAIN defaults to nil, unless it's
called with prefix argument.  When optional argument MSG is
non-nil, forces display of a user-friendly message if there's no
process running; defaults to t when called interactively."
  (interactive
   (list (region-beginning) (region-end) current-prefix-arg t))
  (let* ((string (python-shell-buffer-substring start end (not send-main)
                                                no-cookie))
         (process (python-shell-get-process-or-error msg))
         (original-string (buffer-substring-no-properties start end))
         (_ (string-match "\\`\n*\\(.*\\)" original-string)))
    (message "Sent: %s..." (match-string 1 original-string))
    ;; Recalculate positions to avoid landing on the wrong line if
    ;; lines have been removed/added.
    (with-current-buffer (process-buffer process)
      (compilation-forget-errors))
    (python-shell-send-string string process)
    (deactivate-mark)))

(defun python-shell-send-statement (&optional send-main msg)
  "Send the statement at point to inferior Python process.
The statement is delimited by `python-nav-beginning-of-statement' and
`python-nav-end-of-statement', but if the region  is active, the text
in the region is sent instead via `python-shell-send-region'.
Optional argument SEND-MAIN, if non-nil, means allow execution of code
inside blocks delimited by \"if __name__ == \\='__main__\\=':\".
Interactively, SEND-MAIN is the prefix argument.
Optional argument MSG, if non-nil, forces display of a user-friendly
message if there's no process running; it defaults to t when called
interactively."
  (interactive (list current-prefix-arg t))
  (if (region-active-p)
      (python-shell-send-region (region-beginning) (region-end) send-main msg)
    (python-shell-send-region
     (save-excursion (python-nav-beginning-of-statement))
     (save-excursion (python-nav-end-of-statement))
     send-main msg t)))

(defun python-shell-send-buffer (&optional send-main msg)
  "Send the entire buffer to inferior Python process.
When optional argument SEND-MAIN is non-nil, allow execution of
code inside blocks delimited by \"if __name__== \\='__main__\\=':\".
When called interactively SEND-MAIN defaults to nil, unless it's
called with prefix argument.  When optional argument MSG is
non-nil, forces display of a user-friendly message if there's no
process running; defaults to t when called interactively."
  (interactive (list current-prefix-arg t))
  (save-restriction
    (widen)
    (python-shell-send-region (point-min) (point-max) send-main msg)))

(defun python-shell-send-defun (&optional arg msg)
  "Send the current defun to inferior Python process.
When argument ARG is non-nil do not include decorators.  When
optional argument MSG is non-nil, forces display of a
user-friendly message if there's no process running; defaults to
t when called interactively."
  (interactive (list current-prefix-arg t))
  (let ((starting-pos (point)))
    (save-excursion
      (python-shell-send-region
       (progn
         (end-of-line 1)
         (while (and (or (python-nav-beginning-of-defun)
                         (beginning-of-line 1))
                     (> (current-indentation) 0)))
         (when (not arg)
           (while (and
                   (eq (forward-line -1) 0)
                   (if (looking-at (python-rx decorator))
                       t
                     (forward-line 1)
                     nil))))
         (point-marker))
       (progn
         (goto-char starting-pos)
         (or (python-nav-end-of-defun)
             (end-of-line 1))
         (point-marker))
       nil ;; noop
       msg))))

(defun python-shell-send-file (file-name &optional process temp-file-name
                                         delete msg)
  "Send FILE-NAME to inferior Python PROCESS.

If TEMP-FILE-NAME is passed then that file is used for processing
instead, while internally the shell will continue to use
FILE-NAME.  FILE-NAME can be remote, but TEMP-FILE-NAME must be
in the same host as PROCESS.  If TEMP-FILE-NAME and DELETE are
non-nil, then TEMP-FILE-NAME is deleted after evaluation is
performed.

When optional argument MSG is non-nil, forces display of a
user-friendly message if there's no process running; defaults to
t when called interactively."
  (interactive
   (list
    (read-file-name "File to send: ")   ; file-name
    nil                                 ; process
    nil                                 ; temp-file-name
    nil                                 ; delete
    t))                                 ; msg
  (setq process (or process (python-shell-get-process-or-error msg)))
  (with-current-buffer (process-buffer process)
    (unless (or temp-file-name
                (string= (file-remote-p file-name)
                         (file-remote-p default-directory)))
      (setq delete t
            temp-file-name (with-temp-buffer
                             (insert-file-contents file-name)
                             (python-shell--save-temp-file (current-buffer))))))
  (let* ((file-name (file-local-name (expand-file-name file-name)))
         (temp-file-name (when temp-file-name
                           (file-local-name (expand-file-name
                                             temp-file-name)))))
    (comint-send-string
     process
     (format
      "__PYTHON_EL_eval_file(%s, %s, %s)\n"
      (python-shell--encode-string file-name)
      (python-shell--encode-string (or temp-file-name ""))
      (if delete "True" "False")))))

(defun python-shell-switch-to-shell (&optional msg)
  "Switch to inferior Python process buffer.
When optional argument MSG is non-nil, forces display of a
user-friendly message if there's no process running; defaults to
t when called interactively."
  (interactive "p")
  (pop-to-buffer
   (process-buffer (python-shell-get-process-or-error msg))
   nil 'mark-for-redisplay))

(defun python-shell-send-setup-code ()
  "Send all setup code for shell.
This function takes the list of setup code to send from the
`python-shell-setup-codes' list."
  (when python-shell-setup-codes
    (let ((process (python-shell-get-process))
          (code (concat
                 (mapconcat
                  (lambda (elt)
                    (cond ((stringp elt) elt)
                          ((symbolp elt) (symbol-value elt))
                          (t "")))
                  python-shell-setup-codes
                  "\n\nprint ('python.el: sent setup code')"))))
      (python-shell-send-string code process)
      (python-shell-accept-process-output process))))

(add-hook 'python-shell-first-prompt-hook
          #'python-shell-send-setup-code)

\f
;;; Shell completion

(defcustom python-shell-completion-setup-code
  "
def __PYTHON_EL_get_completions(text):
    completions = []
    completer = None

    try:
        import readline

        try:
            import __builtin__
        except ImportError:
            # Python 3
            import builtins as __builtin__
        builtins = dir(__builtin__)

        is_ipython = ('__IPYTHON__' in builtins or
                      '__IPYTHON__active' in builtins)
        splits = text.split()
        is_module = splits and splits[0] in ('from', 'import')

        if is_ipython and is_module:
            from IPython.core.completerlib import module_completion
            completions = module_completion(text.strip())
        elif is_ipython and '__IP' in builtins:
            completions = __IP.complete(text)
        elif is_ipython and 'get_ipython' in builtins:
            completions = get_ipython().Completer.all_completions(text)
        else:
            # Try to reuse current completer.
            completer = readline.get_completer()
            if not completer:
                # importing rlcompleter sets the completer, use it as a
                # last resort to avoid breaking customizations.
                import rlcompleter
                completer = readline.get_completer()
            if getattr(completer, 'PYTHON_EL_WRAPPED', False):
                completer.print_mode = False
            i = 0
            while True:
                completion = completer(text, i)
                if not completion:
                    break
                i += 1
                completions.append(completion)
    except:
        pass
    finally:
        if getattr(completer, 'PYTHON_EL_WRAPPED', False):
            completer.print_mode = True
    return completions"
  "Code used to setup completion in inferior Python processes."
  :type 'string)

(define-obsolete-variable-alias
  'python-shell-completion-module-string-code
  'python-shell-completion-string-code
  "24.4"
  "Completion string code must also autocomplete modules.")

(define-obsolete-variable-alias
  'python-shell-completion-pdb-string-code
  'python-shell-completion-string-code
  "25.1"
  "Completion string code must work for (i)pdb.")

(defcustom python-shell-completion-native-disabled-interpreters
  ;; PyPy's readline cannot handle some escape sequences yet.  Native
  ;; completion doesn't work on w32 (Bug#28580).
  (if (eq system-type 'windows-nt) '("")
    '("pypy"))
  "List of disabled interpreters.
When a match is found, native completion is disabled."
  :version "28.1"
  :type '(repeat string))

(defcustom python-shell-completion-native-enable t
  "Enable readline based native completion."
  :version "25.1"
  :type 'boolean)

(defcustom python-shell-completion-native-output-timeout 5.0
  "Time in seconds to wait for completion output before giving up."
  :version "25.1"
  :type 'float)

(defcustom python-shell-completion-native-try-output-timeout 1.0
  "Time in seconds to wait for *trying* native completion output."
  :version "25.1"
  :type 'float)

(defvar python-shell-completion-native-redirect-buffer
  " *Python completions redirect*"
  "Buffer to be used to redirect output of readline commands.")

(defun python-shell-completion-native-interpreter-disabled-p ()
  "Return non-nil if interpreter has native completion disabled."
  (when python-shell-completion-native-disabled-interpreters
    (string-match
     (regexp-opt python-shell-completion-native-disabled-interpreters)
     (file-name-nondirectory python-shell-interpreter))))

(defun python-shell-completion-native-try ()
  "Return non-nil if can trigger native completion."
  (let ((python-shell-completion-native-enable t)
        (python-shell-completion-native-output-timeout
         python-shell-completion-native-try-output-timeout))
    (python-shell-completion-native-get-completions
     (get-buffer-process (current-buffer))
     "_")))

(defun python-shell-completion-native-setup ()
  "Try to setup native completion, return non-nil on success."
  (let* ((process (python-shell-get-process))
         (output (python-shell-send-string-no-output "
def __PYTHON_EL_native_completion_setup():
    try:
        import readline

        try:
            import __builtin__
        except ImportError:
            # Python 3
            import builtins as __builtin__

        builtins = dir(__builtin__)
        is_ipython = ('__IPYTHON__' in builtins or
                      '__IPYTHON__active' in builtins)

        class __PYTHON_EL_Completer:
            '''Completer wrapper that prints candidates to stdout.

            It wraps an existing completer function and changes its behavior so
            that the user input is unchanged and real candidates are printed to
            stdout.

            Returned candidates are '0__dummy_completion__' and
            '1__dummy_completion__' in that order ('0__dummy_completion__' is
            returned repeatedly until all possible candidates are consumed).

            The real candidates are printed to stdout so that they can be
            easily retrieved through comint output redirect trickery.
            '''

            PYTHON_EL_WRAPPED = True

            def __init__(self, completer):
                self.completer = completer
                self.last_completion = None
                self.print_mode = True

            def __call__(self, text, state):
                if state == 0:
                    # Set the first dummy completion.
                    self.last_completion = None
                    completion = '0__dummy_completion__'
                else:
                    completion = self.completer(text, state - 1)

                if not completion:
                    if self.last_completion != '1__dummy_completion__':
                        # When no more completions are available, returning a
                        # dummy with non-sharing prefix allow ensuring output
                        # while preventing changes to current input.
                        # Coincidentally it's also the end of output.
                        completion = '1__dummy_completion__'
                elif completion.endswith('('):
                    # Remove parens on callables as it breaks completion on
                    # arguments (e.g. str(Ari<tab>)).
                    completion = completion[:-1]
                self.last_completion = completion

                if completion in (
                        '0__dummy_completion__', '1__dummy_completion__'):
                    return completion
                elif completion:
                    # For every non-dummy completion, return a repeated dummy
                    # one and print the real candidate so it can be retrieved
                    # by comint output filters.
                    if self.print_mode:
                        print (completion)
                        return '0__dummy_completion__'
                    else:
                        return completion
                else:
                    return completion

        completer = readline.get_completer()

        if not completer:
            # Used as last resort to avoid breaking customizations.
            import rlcompleter
            completer = readline.get_completer()

        if completer and not getattr(completer, 'PYTHON_EL_WRAPPED', False):
            # Wrap the existing completer function only once.
            new_completer = __PYTHON_EL_Completer(completer)
            if not is_ipython:
                readline.set_completer(new_completer)
            else:
                # Try both initializations to cope with all IPython versions.
                # This works fine for IPython 3.x but not for earlier:
                readline.set_completer(new_completer)
                # IPython<3 hacks readline such that `readline.set_completer`
                # won't work.  This workaround injects the new completer
                # function into the existing instance directly:
                instance = getattr(completer, 'im_self', completer.__self__)
                instance.rlcomplete = new_completer

        if readline.__doc__ and 'libedit' in readline.__doc__:
            raise Exception('''libedit based readline is known not to work,
      see etc/PROBLEMS under \"In Inferior Python mode, input is echoed\".''')
            readline.parse_and_bind('bind ^I rl_complete')
        else:
            readline.parse_and_bind('tab: complete')
            # Require just one tab to send output.
            readline.parse_and_bind('set show-all-if-ambiguous on')
            # Avoid replacing common prefix with ellipsis.
            readline.parse_and_bind('set completion-prefix-display-length 0')

        print ('python.el: native completion setup loaded')
    except:
        import sys
        print ('python.el: native completion setup failed, %s: %s'
               % sys.exc_info()[:2])

__PYTHON_EL_native_completion_setup()" process)))
    (when (string-match-p "python\\.el: native completion setup loaded"
                          output)
      (python-shell-completion-native-try))))

(defun python-shell-completion-native-turn-off (&optional msg)
  "Turn off shell native completions.
With argument MSG show deactivation message."
  (interactive "p")
  (python-shell-with-shell-buffer
    (setq-local python-shell-completion-native-enable nil)
    (when msg
      (message "Shell native completion is disabled, using fallback"))))

(defun python-shell-completion-native-turn-on (&optional msg)
  "Turn on shell native completions.
With argument MSG show deactivation message."
  (interactive "p")
  (python-shell-with-shell-buffer
    (setq-local python-shell-completion-native-enable t)
    (python-shell-completion-native-turn-on-maybe msg)))

(defun python-shell-completion-native-turn-on-maybe (&optional msg)
  "Turn on native completions if enabled and available.
With argument MSG show activation/deactivation message."
  (interactive "p")
  (python-shell-with-shell-buffer
    (when python-shell-completion-native-enable
      (cond
       ((python-shell-completion-native-interpreter-disabled-p)
        (python-shell-completion-native-turn-off msg))
       ((python-shell-completion-native-setup)
        (when msg
          (message "Shell native completion is enabled.")))
       (t (lwarn
           '(python python-shell-completion-native-turn-on-maybe)
           :warning
           (concat
            "Your `python-shell-interpreter' doesn't seem to "
            "support readline, yet `python-shell-completion-native-enable' "
            (format "was t and %S is not part of the "
                    (file-name-nondirectory python-shell-interpreter))
            "`python-shell-completion-native-disabled-interpreters' "
            "list.  Native completions have been disabled locally. "
            "Consider installing the python package \"readline\". "))
          (python-shell-completion-native-turn-off msg))))))

(defun python-shell-completion-native-turn-on-maybe-with-msg ()
  "Like `python-shell-completion-native-turn-on-maybe' but force messages."
  (python-shell-completion-native-turn-on-maybe t))

(add-hook 'python-shell-first-prompt-hook
          #'python-shell-completion-native-turn-on-maybe-with-msg)

(defun python-shell-completion-native-toggle (&optional msg)
  "Toggle shell native completion.
With argument MSG show activation/deactivation message."
  (interactive "p")
  (python-shell-with-shell-buffer
    (if python-shell-completion-native-enable
        (python-shell-completion-native-turn-off msg)
      (python-shell-completion-native-turn-on msg))
    python-shell-completion-native-enable))

(defun python-shell-completion-native-get-completions (process input)
  "Get completions of INPUT using native readline for PROCESS."
  (with-current-buffer (process-buffer process)
    (let* ((original-filter-fn (process-filter process))
           (redirect-buffer (get-buffer-create
                             python-shell-completion-native-redirect-buffer))
           (trigger "\t")
           (new-input (concat input trigger))
           (input-length
            (save-excursion
              (+ (- (point-max) (comint-bol)) (length new-input))))
           (delete-line-command (make-string input-length ?\b))
           (input-to-send (concat new-input delete-line-command)))
      ;; Ensure restoring the process filter, even if the user quits
      ;; or there's some other error.
      (unwind-protect
          (with-current-buffer redirect-buffer
            ;; Cleanup the redirect buffer
            (erase-buffer)
            ;; Mimic `comint-redirect-send-command', unfortunately it
            ;; can't be used here because it expects a newline in the
            ;; command and that's exactly what we are trying to avoid.
            (let ((comint-redirect-echo-input nil)
                  (comint-redirect-completed nil)
                  (comint-redirect-perform-sanity-check nil)
                  (comint-redirect-insert-matching-regexp t)
                  (comint-redirect-finished-regexp
                   "1__dummy_completion__.*\n")
                  (comint-redirect-output-buffer redirect-buffer))
              ;; Compatibility with Emacs 24.x.  Comint changed and
              ;; now `comint-redirect-filter' gets 3 args.  This
              ;; checks which version of `comint-redirect-filter' is
              ;; in use based on its args and uses `apply-partially'
              ;; to make it up for the 3 args case.
              (if (= (length
                      (help-function-arglist 'comint-redirect-filter))
                     3)
                  (set-process-filter
                   process (apply-partially
                            #'comint-redirect-filter original-filter-fn))
                (set-process-filter process #'comint-redirect-filter))
              (process-send-string process input-to-send)
              ;; Grab output until our dummy completion used as
              ;; output end marker is found.
              (when (python-shell-accept-process-output
                     process python-shell-completion-native-output-timeout
                     comint-redirect-finished-regexp)
                (re-search-backward "0__dummy_completion__" nil t)
                (cl-remove-duplicates
                 (split-string
                  (buffer-substring-no-properties
                   (line-beginning-position) (point-min))
                  "[ \f\t\n\r\v()]+" t)
                 :test #'string=))))
        (set-process-filter process original-filter-fn)))))

(defun python-shell-completion-get-completions (process input)
  "Get completions of INPUT using PROCESS."
  (with-current-buffer (process-buffer process)
    (let ((completions
           (python-util-strip-string
            (python-shell-send-string-no-output
             (format
              "%s\nprint(';'.join(__PYTHON_EL_get_completions(%s)))"
              python-shell-completion-setup-code
              (python-shell--encode-string input))
             process))))
      (when (> (length completions) 2)
        (split-string completions
                      "^'\\|^\"\\|;\\|'$\\|\"$" t)))))

(defvar-local python-shell--capf-cache nil
  "Variable to store cached completions and invalidation keys.")

(defun python-shell-completion-at-point (&optional process)
  "Function for `completion-at-point-functions' in `inferior-python-mode'.
Optional argument PROCESS forces completions to be retrieved
using that one instead of current buffer's process."
  (setq process (or process (get-buffer-process (current-buffer))))
  (let* ((line-start (if (derived-mode-p 'inferior-python-mode)
                         ;; Working on a shell buffer: use prompt end.
                         (cdr (python-util-comint-last-prompt))
                       (line-beginning-position)))
         (import-statement
          (when (string-match-p
                 (rx (* space) word-start (or "from" "import") word-end space)
                 (buffer-substring-no-properties line-start (point)))
            (buffer-substring-no-properties line-start (point))))
         (start
          (save-excursion
            (if (not (re-search-backward
                      (python-rx
                       (or whitespace open-paren close-paren string-delimiter simple-operator))
                      line-start
                      t 1))
                line-start
              (forward-char (length (match-string-no-properties 0)))
              (point))))
         (end (point))
         (prompt-boundaries
          (with-current-buffer (process-buffer process)
            (python-util-comint-last-prompt)))
         (prompt
          (with-current-buffer (process-buffer process)
            (when prompt-boundaries
              (buffer-substring-no-properties
               (car prompt-boundaries) (cdr prompt-boundaries)))))
         (completion-fn
          (with-current-buffer (process-buffer process)
            (cond ((or (null prompt)
                       (< (point) (cdr prompt-boundaries)))
                   #'ignore)
                  ((or (not python-shell-completion-native-enable)
                       ;; Even if native completion is enabled, for
                       ;; pdb interaction always use the fallback
                       ;; mechanism since the completer is changed.
                       ;; Also, since pdb interaction is single-line
                       ;; based, this is enough.
                       (string-match-p python-shell-prompt-pdb-regexp prompt))
                   (if (or (equal python-shell--block-prompt prompt)
                           (string-match-p
                            python-shell-prompt-block-regexp prompt))
                       ;; The non-native completion mechanism sends
                       ;; newlines to the interpreter, so we can't use
                       ;; it during a multiline statement (Bug#28051).
                       #'ignore
                     #'python-shell-completion-get-completions))
                  (t #'python-shell-completion-native-get-completions))))
         (prev-prompt (car python-shell--capf-cache))
         (re (or (cadr python-shell--capf-cache) regexp-unmatchable))
         (prefix (buffer-substring-no-properties start end)))
    ;; To invalidate the cache, we check if the prompt position or the
    ;; completion prefix changed.
    (unless (and (equal prev-prompt (car prompt-boundaries))
                 (string-match re prefix))
      (setq python-shell--capf-cache
            `(,(car prompt-boundaries)
              ,(if (string-empty-p prefix)
                   regexp-unmatchable
                 (concat "\\`" (regexp-quote prefix) "\\(?:\\sw\\|\\s_\\)*\\'"))
              ,@(funcall completion-fn process (or import-statement prefix)))))
    (list start end (cddr python-shell--capf-cache))))

(define-obsolete-function-alias
  'python-shell-completion-complete-at-point
  #'python-shell-completion-at-point
  "25.1")

(defun python-shell-completion-complete-or-indent ()
  "Complete or indent depending on the context.
If content before pointer is all whitespace, indent.
If not try to complete."
  (interactive)
  (if (string-match "^[[:space:]]*$"
                    (buffer-substring (comint-line-beginning-position)
                                      (point)))
      (indent-for-tab-command)
    (completion-at-point)))

\f
;;; PDB Track integration

(defcustom python-pdbtrack-activate t
  "Non-nil makes Python shell enable pdbtracking.
Pdbtracking would open the file for current stack frame found in pdb output by
`python-pdbtrack-stacktrace-info-regexp' and add overlay arrow in currently
inspected line in that file.

After the command listed in `python-pdbtrack-continue-command' or
`python-pdbtrack-exit-command' is sent to pdb, the pdbtracking session is
considered over.  The overlay arrow will be removed from the currently tracked
buffer.  Additionally, if `python-pdbtrack-kill-buffers' is non-nil, all
files opened by pdbtracking will be killed."
  :type 'boolean
  :safe 'booleanp)

(defcustom python-pdbtrack-stacktrace-info-regexp
  "> \\([^\"(]+\\)(\\([0-9]+\\))\\([?a-zA-Z0-9_<>]+\\)()"
  "Regular expression matching stacktrace information.
Used to extract the current line and module being inspected.

Must match lines with real filename, like
 > /path/to/file.py(42)<module>()->None
and lines in which filename starts with `<', e.g.
 > <stdin>(1)<module>()->None

In the first case /path/to/file.py file will be visited and overlay icon
will be placed in line 42.
In the second case pdbtracking session will be considered over because
the top stack frame has been reached.

Filename is expected in the first parenthesized expression.
Line number is expected in the second parenthesized expression."
  :type 'regexp
  :version "27.1"
  :safe 'stringp)

(defcustom python-pdbtrack-continue-command '("c" "cont" "continue")
  "Pdb `continue' command aliases.
After one of these commands is sent to pdb, the pdbtracking session is
considered over.

This command is remembered by pdbtracking.  If the next command sent to pdb
is the empty string, it is treated as `continue' if the previous command
was `continue'.  This behavior slightly differentiates the `continue' command
from the `exit' command listed in `python-pdbtrack-exit-command'.

See `python-pdbtrack-activate' for pdbtracking session overview."
  :type '(repeat string)
  :version "27.1")

(defcustom python-pdbtrack-exit-command '("q" "quit" "exit")
  "Pdb `exit' command aliases.
After one of this commands is sent to pdb, pdbtracking session is
considered over.

See `python-pdbtrack-activate' for pdbtracking session overview."
  :type '(repeat string)
  :version "27.1")

(defcustom python-pdbtrack-kill-buffers t
  "If non-nil, kill buffers when pdbtracking session is over.
Only buffers opened by pdbtracking will be killed.

See `python-pdbtrack-activate' for pdbtracking session overview."
  :type 'boolean
  :version "27.1")

(defvar python-pdbtrack-tracked-buffer nil
  "Variable containing the value of the current tracked buffer.
Never set this variable directly, use
`python-pdbtrack-set-tracked-buffer' instead.")

(defvar python-pdbtrack-buffers-to-kill nil
  "List of buffers to be deleted after tracking finishes.")

(defvar python-pdbtrack-prev-command-continue nil
  "Is t if previous pdb command was `continue'.")

(defun python-pdbtrack-set-tracked-buffer (file-name)
  "Set the buffer for FILE-NAME as the tracked buffer.
Internally it uses the `python-pdbtrack-tracked-buffer' variable.
Returns the tracked buffer."
  (let* ((file-name-prospect (concat (file-remote-p default-directory)
                              file-name))
         (file-buffer (get-file-buffer file-name-prospect)))
    (unless file-buffer
      (cond
       ((file-exists-p file-name-prospect)
        (setq file-buffer (find-file-noselect file-name-prospect)))
       ((and (not (equal file-name file-name-prospect))
             (file-exists-p file-name))
        ;; Fallback to a locally available copy of the file.
        (setq file-buffer (find-file-noselect file-name-prospect))))
      (when (and python-pdbtrack-kill-buffers
                 (not (member file-buffer python-pdbtrack-buffers-to-kill)))
        (add-to-list 'python-pdbtrack-buffers-to-kill file-buffer)))
    (setq python-pdbtrack-tracked-buffer file-buffer)
    file-buffer))

(defun python-pdbtrack-unset-tracked-buffer ()
  "Untrack currently tracked buffer."
  (when (buffer-live-p python-pdbtrack-tracked-buffer)
    (with-current-buffer python-pdbtrack-tracked-buffer
      (set-marker overlay-arrow-position nil)))
  (setq python-pdbtrack-tracked-buffer nil))

(defun python-pdbtrack-tracking-finish ()
  "Finish tracking."
  (python-pdbtrack-unset-tracked-buffer)
  (when python-pdbtrack-kill-buffers
    (mapc (lambda (buffer)
            (ignore-errors (kill-buffer buffer)))
            python-pdbtrack-buffers-to-kill))
  (setq python-pdbtrack-buffers-to-kill nil))

(defun python-pdbtrack-process-sentinel (process _event)
  "Untrack buffers when PROCESS is killed."
  (unless (process-live-p process)
    (let ((buffer (process-buffer process)))
      (when (buffer-live-p buffer)
        (with-current-buffer buffer
          (python-pdbtrack-tracking-finish))))))

(defun python-pdbtrack-comint-input-filter-function (input)
  "Finish tracking session depending on command in INPUT.
Commands that must finish the tracking session are listed in
`python-pdbtrack-exit-command'."
  (when (and python-pdbtrack-tracked-buffer
             ;; Empty input is sent by C-d or `comint-send-eof'
             (or (string-empty-p input)
                 ;; "n some text" is "n" command for pdb. Split input and get firs part
                 (let* ((command (car (split-string (string-trim input) " "))))
                   (setq python-pdbtrack-prev-command-continue
                         (or (member command python-pdbtrack-continue-command)
                             ;; if command is empty and previous command was 'continue'
                             ;; then current command is 'continue' too.
                             (and (string-empty-p command)
                                  python-pdbtrack-prev-command-continue)))
                   (or python-pdbtrack-prev-command-continue
                       (member command python-pdbtrack-exit-command)))))
    (python-pdbtrack-tracking-finish)))

(defun python-pdbtrack-comint-output-filter-function (output)
  "Move overlay arrow to current pdb line in tracked buffer.
Argument OUTPUT is a string with the output from the comint process."
  (when (and python-pdbtrack-activate (not (string= output "")))
    (let* ((full-output (ansi-color-filter-apply
                         (buffer-substring comint-last-input-end (point-max))))
           (line-number)
           (file-name
            (with-temp-buffer
              (insert full-output)
              ;; When the debugger encounters a pdb.set_trace()
              ;; command, it prints a single stack frame.  Sometimes
              ;; it prints a bit of extra information about the
              ;; arguments of the present function.  When ipdb
              ;; encounters an exception, it prints the _entire_ stack
              ;; trace.  To handle all of these cases, we want to find
              ;; the _last_ stack frame printed in the most recent
              ;; batch of output, then jump to the corresponding
              ;; file/line number.
              ;; Parse output only if at pdb prompt to avoid double code
              ;; run in situation when output and pdb prompt received in
              ;; different hunks
              (goto-char (point-max))
              (goto-char (line-beginning-position))
              (when (and (looking-at python-shell-prompt-pdb-regexp)
                         (re-search-backward python-pdbtrack-stacktrace-info-regexp nil t))
                (setq line-number (string-to-number
                                   (match-string-no-properties 2)))
                (match-string-no-properties 1)))))
      (when (and file-name line-number)
        (if (string-prefix-p "<" file-name)
            ;; Finish tracking session if stacktrace info is like
            ;; "> <stdin>(1)<module>()->None"
            (python-pdbtrack-tracking-finish)
          (python-pdbtrack-unset-tracked-buffer)
          (let* ((tracked-buffer (python-pdbtrack-set-tracked-buffer file-name))
                 (shell-buffer (current-buffer))
                 (tracked-buffer-window (get-buffer-window tracked-buffer))
                 (tracked-buffer-line-pos))
            (with-current-buffer tracked-buffer
              (setq-local overlay-arrow-position (make-marker))
              (setq tracked-buffer-line-pos (progn
                                              (goto-char (point-min))
                                              (forward-line (1- line-number))
                                              (point-marker)))
              (when tracked-buffer-window
                (set-window-point
                 tracked-buffer-window tracked-buffer-line-pos))
              (set-marker overlay-arrow-position tracked-buffer-line-pos))
            (pop-to-buffer tracked-buffer)
            (switch-to-buffer-other-window shell-buffer))))))
  output)

(defun python-pdbtrack-setup-tracking ()
  "Setup pdb tracking in current buffer."
  (make-local-variable 'python-pdbtrack-buffers-to-kill)
  (make-local-variable 'python-pdbtrack-tracked-buffer)
  (add-hook 'comint-input-filter-functions
            #'python-pdbtrack-comint-input-filter-function nil t)
  (add-to-list (make-local-variable 'comint-output-filter-functions)
               #'python-pdbtrack-comint-output-filter-function)
  (add-function :before (process-sentinel (get-buffer-process (current-buffer)))
                #'python-pdbtrack-process-sentinel)
  (add-hook 'kill-buffer-hook #'python-pdbtrack-tracking-finish nil t))

\f
;;; Symbol completion

(defun python-completion-at-point ()
  "Function for `completion-at-point-functions' in `python-mode'.
For this to work as best as possible you should call
`python-shell-send-buffer' from time to time so context in
inferior Python process is updated properly."
  (let ((process (python-shell-get-process)))
    (when process
      (python-shell-completion-at-point process))))

(define-obsolete-function-alias
  'python-completion-complete-at-point
  #'python-completion-at-point
  "25.1")

\f
;;; Fill paragraph

(defcustom python-fill-comment-function 'python-fill-comment
  "Function to fill comments.
This is the function used by `python-fill-paragraph' to
fill comments."
  :type 'symbol)

(defcustom python-fill-string-function 'python-fill-string
  "Function to fill strings.
This is the function used by `python-fill-paragraph' to
fill strings."
  :type 'symbol)

(defcustom python-fill-decorator-function 'python-fill-decorator
  "Function to fill decorators.
This is the function used by `python-fill-paragraph' to
fill decorators."
  :type 'symbol)

(defcustom python-fill-paren-function 'python-fill-paren
  "Function to fill parens.
This is the function used by `python-fill-paragraph' to
fill parens."
  :type 'symbol)

(defcustom python-fill-docstring-style 'pep-257
  "Style used to fill docstrings.
This affects `python-fill-string' behavior with regards to
triple quotes positioning.

Possible values are `django', `onetwo', `pep-257', `pep-257-nn',
`symmetric', and nil.  A value of nil won't care about quotes
position and will treat docstrings a normal string, any other
value may result in one of the following docstring styles:

`django':

    \"\"\"
    Process foo, return bar.
    \"\"\"

    \"\"\"
    Process foo, return bar.

    If processing fails throw ProcessingError.
    \"\"\"

`onetwo':

    \"\"\"Process foo, return bar.\"\"\"

    \"\"\"
    Process foo, return bar.

    If processing fails throw ProcessingError.

    \"\"\"

`pep-257':

    \"\"\"Process foo, return bar.\"\"\"

    \"\"\"Process foo, return bar.

    If processing fails throw ProcessingError.

    \"\"\"

`pep-257-nn':

    \"\"\"Process foo, return bar.\"\"\"

    \"\"\"Process foo, return bar.

    If processing fails throw ProcessingError.
    \"\"\"

`symmetric':

    \"\"\"Process foo, return bar.\"\"\"

    \"\"\"
    Process foo, return bar.

    If processing fails throw ProcessingError.
    \"\"\""
  :type '(choice
          (const :tag "Don't format docstrings" nil)
          (const :tag "Django's coding standards style." django)
          (const :tag "One newline and start and Two at end style." onetwo)
          (const :tag "PEP-257 with 2 newlines at end of string." pep-257)
          (const :tag "PEP-257 with 1 newline at end of string." pep-257-nn)
          (const :tag "Symmetric style." symmetric))
  :safe (lambda (val)
          (memq val '(django onetwo pep-257 pep-257-nn symmetric nil))))

(defun python-fill-paragraph (&optional justify)
  "`fill-paragraph-function' handling multi-line strings and possibly comments.
If any of the current line is in or at the end of a multi-line string,
fill the string or the paragraph of it that point is in, preserving
the string's indentation.
Optional argument JUSTIFY defines if the paragraph should be justified."
  (interactive "P")
  (save-excursion
    (cond
     ;; Comments
     ((python-syntax-context 'comment)
      (funcall python-fill-comment-function justify))
     ;; Strings/Docstrings
     ((save-excursion (or (python-syntax-context 'string)
                          (equal (string-to-syntax "|")
                                 (syntax-after (point)))))
      (funcall python-fill-string-function justify))
     ;; Decorators
     ((equal (char-after (save-excursion
                           (python-nav-beginning-of-statement))) ?@)
      (funcall python-fill-decorator-function justify))
     ;; Parens
     ((or (python-syntax-context 'paren)
          (looking-at (python-rx open-paren))
          (save-excursion
            (skip-syntax-forward "^(" (line-end-position))
            (looking-at (python-rx open-paren))))
      (funcall python-fill-paren-function justify))
     (t t))))

(defun python-fill-comment (&optional justify)
  "Comment fill function for `python-fill-paragraph'.
JUSTIFY should be used (if applicable) as in `fill-paragraph'."
  (fill-comment-paragraph justify))

(defun python-fill-string (&optional justify)
  "String fill function for `python-fill-paragraph'.
JUSTIFY should be used (if applicable) as in `fill-paragraph'."
  (let* ((str-start-pos
          (set-marker
           (make-marker)
           (or (python-syntax-context 'string)
               (and (equal (string-to-syntax "|")
                           (syntax-after (point)))
                    (point)))))
         ;; JT@2021-09-21: Since bug#49518's fix this will always be 1
         (num-quotes (python-syntax-count-quotes
                      (char-after str-start-pos) str-start-pos))
         (str-line-start-pos
          (save-excursion
            (goto-char str-start-pos)
            (beginning-of-line)
            (point-marker)))
         (str-end-pos
          (save-excursion
            (goto-char (+ str-start-pos num-quotes))
            (or (re-search-forward (rx (syntax string-delimiter)) nil t)
                (goto-char (point-max)))
            (point-marker)))
         (multi-line-p
          ;; Docstring styles may vary for one-liners and multi-liners.
          (> (count-matches "\n" str-start-pos str-end-pos) 0))
         (delimiters-style
          (pcase python-fill-docstring-style
            ;; delimiters-style is a cons cell with the form
            ;; (START-NEWLINES .  END-NEWLINES). When any of the sexps
            ;; is NIL means to not add any newlines for start or end
            ;; of docstring.  See `python-fill-docstring-style' for a
            ;; graphic idea of each style.
            ('django (cons 1 1))
            ('onetwo (and multi-line-p (cons 1 2)))
            ('pep-257 (and multi-line-p (cons nil 2)))
            ('pep-257-nn (and multi-line-p (cons nil 1)))
            ('symmetric (and multi-line-p (cons 1 1)))))
         (fill-paragraph-function))
    (save-restriction
      (narrow-to-region str-line-start-pos str-end-pos)
      (fill-paragraph justify))
    (save-excursion
      (when (and (python-info-docstring-p) python-fill-docstring-style)
        ;; Add the number of newlines indicated by the selected style
        ;; at the start of the docstring.
        (goto-char (+ str-start-pos num-quotes))
        (delete-region (point) (progn
                                 (skip-syntax-forward "> ")
                                 (point)))
        (and (car delimiters-style)
             (or (newline (car delimiters-style)) t)
             ;; Indent only if a newline is added.
             (indent-according-to-mode))
        ;; Add the number of newlines indicated by the selected style
        ;; at the end of the docstring.
        (goto-char (if (not (= str-end-pos (point-max)))
                       (- str-end-pos num-quotes)
                     str-end-pos))
        (delete-region (point) (progn
                                 (skip-syntax-backward "> ")
                                 (point)))
        (and (cdr delimiters-style)
             ;; Add newlines only if string ends.
             (not (= str-end-pos (point-max)))
             (or (newline (cdr delimiters-style)) t)
             ;; Again indent only if a newline is added.
             (indent-according-to-mode))))) t)

(defun python-fill-decorator (&optional _justify)
  "Decorator fill function for `python-fill-paragraph'.
JUSTIFY should be used (if applicable) as in `fill-paragraph'."
  t)

(defun python-fill-paren (&optional justify)
  "Paren fill function for `python-fill-paragraph'.
JUSTIFY should be used (if applicable) as in `fill-paragraph'."
  (save-restriction
    (narrow-to-region (progn
                        (while (python-syntax-context 'paren)
                          (goto-char (1- (point))))
                        (line-beginning-position))
                      (progn
                        (when (not (python-syntax-context 'paren))
                          (end-of-line)
                          (when (not (python-syntax-context 'paren))
                            (skip-syntax-backward "^)")))
                        (while (and (python-syntax-context 'paren)
                                    (not (eobp)))
                          (goto-char (1+ (point))))
                        (point)))
    (let ((paragraph-start "\f\\|[ \t]*$")
          (paragraph-separate ",")
          (fill-paragraph-function))
      (goto-char (point-min))
      (fill-paragraph justify))
    (while (not (eobp))
      (forward-line 1)
      (python-indent-line)
      (goto-char (line-end-position))))
  t)

(defun python-do-auto-fill ()
  "Like `do-auto-fill', but bind `fill-indent-according-to-mode'."
  ;; See Bug#36056.
  (let ((fill-indent-according-to-mode t))
    (do-auto-fill)))

\f
;;; Skeletons

(define-obsolete-variable-alias
  'python-use-skeletons 'python-skeleton-autoinsert "24.3")

(defcustom python-skeleton-autoinsert nil
  "Non-nil means template skeletons will be automagically inserted.
This happens when pressing \"if<SPACE>\", for example, to prompt for
the if condition."
  :type 'boolean
  :safe 'booleanp)

(defvar python-skeleton-available '()
  "Internal list of available skeletons.")

(define-abbrev-table 'python-mode-skeleton-abbrev-table ()
  "Abbrev table for Python mode skeletons."
  :case-fixed t
  ;; Allow / inside abbrevs.
  :regexp "\\(?:^\\|[^/]\\)\\<\\([[:word:]/]+\\)\\W*"
  ;; Only expand in code.
  :enable-function (lambda ()
                     (and
                      (not (python-syntax-comment-or-string-p))
                      python-skeleton-autoinsert)))

(defmacro python-skeleton-define (name doc &rest skel)
  "Define a `python-mode' skeleton using NAME DOC and SKEL.
The skeleton will be bound to python-skeleton-NAME and will
be added to `python-mode-skeleton-abbrev-table'."
  (declare (indent 2))
  (let* ((name (symbol-name name))
         (function-name (intern (concat "python-skeleton-" name))))
    `(progn
       (define-abbrev python-mode-skeleton-abbrev-table
         ,name "" ',function-name :system t)
       (setq python-skeleton-available
             (cons ',function-name python-skeleton-available))
       (define-skeleton ,function-name
         ,(or doc
              (format "Insert %s statement." name))
         ,@skel))))

(define-abbrev-table 'python-mode-abbrev-table ()
  "Abbrev table for Python mode."
  :parents (list python-mode-skeleton-abbrev-table))

(defmacro python-define-auxiliary-skeleton (name &optional doc &rest skel)
  "Define a `python-mode' auxiliary skeleton using NAME DOC and SKEL.
The skeleton will be bound to python-skeleton-NAME."
  (declare (indent 2))
  (let* ((name (symbol-name name))
         (function-name (intern (concat "python-skeleton--" name)))
         (msg (funcall (if (fboundp 'format-message) #'format-message #'format)
                       "Add `%s' clause? " name)))
    (when (not skel)
      (setq skel
            `(< ,(format "%s:" name) \n \n
                > _ \n)))
    `(define-skeleton ,function-name
       ,(or doc
            (format "Auxiliary skeleton for %s statement." name))
       nil
       (unless (y-or-n-p ,msg)
         (signal 'quit t))
       ,@skel)))

(python-define-auxiliary-skeleton else)

(python-define-auxiliary-skeleton except)

(python-define-auxiliary-skeleton finally)

(python-skeleton-define if nil
  "Condition: "
  "if " str ":" \n
  _ \n
  ("other condition, %s: "
   <
   "elif " str ":" \n
   > _ \n nil)
  '(python-skeleton--else) | ^)

(python-skeleton-define while nil
  "Condition: "
  "while " str ":" \n
  > _ \n
  '(python-skeleton--else) | ^)

(python-skeleton-define for nil
  "Iteration spec: "
  "for " str ":" \n
  > _ \n
  '(python-skeleton--else) | ^)

(python-skeleton-define import nil
  "Import from module: "
  "from " str & " " | -5
  "import "
  ("Identifier: " str ", ") -2 \n _)

(python-skeleton-define try nil
  nil
  "try:" \n
  > _ \n
  ("Exception, %s: "
   <
   "except " str ":" \n
   > _ \n nil)
  resume:
  '(python-skeleton--except)
  '(python-skeleton--else)
  '(python-skeleton--finally) | ^)

(python-skeleton-define def nil
  "Function name: "
  "def " str "(" ("Parameter, %s: "
                  (unless (equal ?\( (char-before)) ", ")
                  str) "):" \n
                  "\"\"\"" - "\"\"\"" \n
                  > _ \n)

(python-skeleton-define class nil
  "Class name: "
  "class " str "(" ("Inheritance, %s: "
                    (unless (equal ?\( (char-before)) ", ")
                    str)
  & ")" | -1
  ":" \n
  "\"\"\"" - "\"\"\"" \n
  > _ \n)

(defun python-skeleton-add-menu-items ()
  "Add menu items to Python->Skeletons menu."
  (let ((skeletons (sort python-skeleton-available #'string<)))
    (dolist (skeleton skeletons)
      (easy-menu-add-item
       nil '("Python" "Skeletons")
       `[,(format
           "Insert %s" (nth 2 (split-string (symbol-name skeleton) "-")))
         ,skeleton t]))))
\f
;;; FFAP

(defcustom python-ffap-setup-code
  "
def __FFAP_get_module_path(objstr):
    try:
        import inspect
        import os.path
        # NameError exceptions are delayed until this point.
        obj = eval(objstr)
        module = inspect.getmodule(obj)
        filename = module.__file__
        ext = os.path.splitext(filename)[1]
        if ext in ('.pyc', '.pyo'):
            # Point to the source file.
            filename = filename[:-1]
        if os.path.exists(filename):
            return filename
        return ''
    except:
        return ''"
  "Python code to get a module path."
  :type 'string)

(defun python-ffap-module-path (module)
  "Function for `ffap-alist' to return path for MODULE."
  (when-let ((process (python-shell-get-process))
             (module-file
              (python-shell-send-string-no-output
               (format "%s\nprint(__FFAP_get_module_path(%s))"
                       python-ffap-setup-code
                       (python-shell--encode-string module)))))
    (unless (string-empty-p module-file)
      (python-util-strip-string module-file))))

(defvar ffap-alist)

(eval-after-load "ffap"
  '(progn
     (push '(python-mode . python-ffap-module-path) ffap-alist)
     (push '(inferior-python-mode . python-ffap-module-path) ffap-alist)))

\f
;;; Code check

(defcustom python-check-command
  (or (executable-find "pyflakes")
      (executable-find "epylint")
      "install pyflakes, pylint or something else")
  "Command used to check a Python file."
  :type 'string)

(defcustom python-check-buffer-name
  "*Python check: %s*"
  "Buffer name used for check commands."
  :type 'string)

(defvar python-check-custom-command nil
  "Internal use.")
;; XXX: Avoid `defvar-local' for compat with Emacs<24.3
(make-variable-buffer-local 'python-check-custom-command)

(defun python-check (command)
  "Check a Python file (default current buffer's file).
Runs COMMAND, a shell command, as if by `compile'.
See `python-check-command' for the default."
  (interactive
   (list (read-string "Check command: "
                      (or python-check-custom-command
                          (concat python-check-command " "
                                  (shell-quote-argument
                                   (or
                                    (let ((name (buffer-file-name)))
                                      (and name
                                           (file-name-nondirectory name)))
                                    "")))))))
  (setq python-check-custom-command command)
  (save-some-buffers (not compilation-ask-about-save) nil)
  (python-shell-with-environment
    (compilation-start command nil
                       (lambda (_modename)
                         (format python-check-buffer-name command)))))

\f
;;; ElDoc

(defcustom python-eldoc-setup-code
  "def __PYDOC_get_help(obj):
    try:
        import inspect
        try:
            str_type = basestring
            argspec_function = inspect.getargspec
        except NameError:
            str_type = str
            argspec_function = inspect.getfullargspec
        if isinstance(obj, str_type):
            obj = eval(obj, globals())
        doc = inspect.getdoc(obj)
        if not doc and callable(obj):
            target = None
            if inspect.isclass(obj) and hasattr(obj, '__init__'):
                target = obj.__init__
                objtype = 'class'
            else:
                target = obj
                objtype = 'def'
            if target:
                if hasattr(inspect, 'signature'):
                    args = str(inspect.signature(target))
                else:
                    args = inspect.formatargspec(*argspec_function(target))
                name = obj.__name__
                doc = '{objtype} {name}{args}'.format(
                    objtype=objtype, name=name, args=args
                )
        else:
            doc = doc.splitlines()[0]
    except:
        doc = ''
    return doc"
  "Python code to setup documentation retrieval."
  :type 'string)

(defun python-eldoc--get-symbol-at-point ()
  "Get the current symbol for eldoc.
Returns the current symbol handling point within arguments."
  (save-excursion
    (let ((start (python-syntax-context 'paren)))
      (when start
        (goto-char start))
      (when (or start
                (eobp)
                (memq (char-syntax (char-after)) '(?\ ?-)))
        ;; Try to adjust to closest symbol if not in one.
        (python-util-forward-comment -1)))
    (python-info-current-symbol t)))

(defun python-eldoc--get-doc-at-point (&optional force-input force-process)
  "Internal implementation to get documentation at point.
If not FORCE-INPUT is passed then what `python-eldoc--get-symbol-at-point'
returns will be used.  If not FORCE-PROCESS is passed what
`python-shell-get-process' returns is used."
  (let ((process (or force-process (python-shell-get-process))))
    (when process
      (let* ((input (or force-input
                        (python-eldoc--get-symbol-at-point)))
             (docstring
              (when input
                ;; Prevent resizing the echo area when iPython is
                ;; enabled.  Bug#18794.
                (python-util-strip-string
                 (python-shell-send-string-no-output
                  (format
                   "%s\nprint(__PYDOC_get_help(%s))"
                   python-eldoc-setup-code
                   (python-shell--encode-string input))
                  process)))))
        (unless (string-empty-p docstring)
          docstring)))))

(defvar-local python-eldoc-get-doc t
  "Non-nil means eldoc should fetch the documentation automatically.
Set to nil by `python-eldoc-function' if
`python-eldoc-function-timeout-permanent' is non-nil and
`python-eldoc-function' times out.")

(defcustom python-eldoc-function-timeout 1
  "Timeout for `python-eldoc-function' in seconds."
  :type 'integer
  :version "25.1")

(defcustom python-eldoc-function-timeout-permanent t
  "If non-nil, a timeout in Python-Eldoc will disable it permanently.
Python-Eldoc can be re-enabled manually by setting `python-eldoc-get-doc'
back to t in the affected buffer."
  :type 'boolean
  :version "25.1")

(defun python-eldoc-function (&rest _ignored)
  "`eldoc-documentation-function' for Python.
For this to work as best as possible you should call
`python-shell-send-buffer' from time to time so context in
inferior Python process is updated properly.

If `python-eldoc-function-timeout' seconds elapse before this
function returns then if
`python-eldoc-function-timeout-permanent' is non-nil
`python-eldoc-get-doc' will be set to nil and eldoc will no
longer return the documentation at the point automatically.

Set `python-eldoc-get-doc' to t to reenable eldoc documentation
fetching."
  (when python-eldoc-get-doc
    (with-timeout (python-eldoc-function-timeout
                   (if python-eldoc-function-timeout-permanent
                       (progn
                         (message "ElDoc echo-area display muted in this buffer, see `python-eldoc-function'")
                         (setq python-eldoc-get-doc nil))
                     (message "`python-eldoc-function' timed out, see `python-eldoc-function-timeout'")))
      (python-eldoc--get-doc-at-point))))

(defun python-eldoc-at-point (symbol)
  "Get help on SYMBOL using `help'.
Interactively, prompt for symbol."
  (interactive
   (let ((symbol (python-eldoc--get-symbol-at-point))
         (enable-recursive-minibuffers t))
     (list (read-string
            ;; `format-prompt' is new in Emacs 28.1.
            (if (fboundp 'format-prompt)
                (format-prompt "Describe symbol" symbol)
              (if symbol
                  (format "Describe symbol (default %s): " symbol)
                "Describe symbol: "))
            nil nil symbol))))
  (message (python-eldoc--get-doc-at-point symbol)))

(defun python-describe-at-point (symbol process)
  (interactive (list (python-info-current-symbol)
                     (python-shell-get-process)))
  (comint-send-string process (concat "help('" symbol "')\n")))

\f
;;; Hideshow

(defun python-hideshow-forward-sexp-function (_arg)
  "Python specific `forward-sexp' function for `hs-minor-mode'.
Argument ARG is ignored."
  (python-nav-end-of-defun)
  (unless (python-info-current-line-empty-p)
    (backward-char)))

\f
;;; Imenu

(defvar python-imenu-format-item-label-function
  'python-imenu-format-item-label
  "Imenu function used to format an item label.
It must be a function with two arguments: TYPE and NAME.")

(defvar python-imenu-format-parent-item-label-function
  'python-imenu-format-parent-item-label
  "Imenu function used to format a parent item label.
It must be a function with two arguments: TYPE and NAME.")

(defvar python-imenu-format-parent-item-jump-label-function
  'python-imenu-format-parent-item-jump-label
  "Imenu function used to format a parent jump item label.
It must be a function with two arguments: TYPE and NAME.")

(defun python-imenu-format-item-label (type name)
  "Return Imenu label for single node using TYPE and NAME."
  (format "%s (%s)" name type))

(defun python-imenu-format-parent-item-label (type name)
  "Return Imenu label for parent node using TYPE and NAME."
  (format "%s..." (python-imenu-format-item-label type name)))

(defun python-imenu-format-parent-item-jump-label (type _name)
  "Return Imenu label for parent node jump using TYPE and NAME."
  (if (string= type "class")
      "*class definition*"
    "*function definition*"))

(defun python-imenu--get-defun-type-name ()
  "Return defun type and name at current position."
  (when (looking-at python-nav-beginning-of-defun-regexp)
    (let ((split (split-string (match-string-no-properties 0))))
      (if (= (length split) 2)
          split
        (list (concat (car split) " " (cadr split))
              (car (last split)))))))

(defun python-imenu--put-parent (type name pos tree)
  "Add the parent with TYPE, NAME and POS to TREE."
  (let ((label
         (funcall python-imenu-format-item-label-function type name))
        (jump-label
         (funcall python-imenu-format-parent-item-jump-label-function type name)))
    (if (not tree)
        (cons label pos)
      (cons label (cons (cons jump-label pos) tree)))))

(defun python-imenu--build-tree (&optional min-indent prev-indent tree)
  "Recursively build the tree of nested definitions of a node.
Arguments MIN-INDENT, PREV-INDENT and TREE are internal and should
not be passed explicitly unless you know what you are doing."
  (setq min-indent (or min-indent 0)
        prev-indent (or prev-indent python-indent-offset))
  (let* ((pos (python-nav-backward-defun))
         (defun-type-name (and pos (python-imenu--get-defun-type-name)))
         (type (car defun-type-name))
         (name (cadr defun-type-name))
         (label (when name
                  (funcall python-imenu-format-item-label-function type name)))
         (indent (current-indentation))
         (children-indent-limit (+ python-indent-offset min-indent)))
    (cond ((not pos)
           ;; Nothing found, probably near to bobp.
           nil)
          ((<= indent min-indent)
           ;; The current indentation points that this is a parent
           ;; node, add it to the tree and stop recursing.
           (python-imenu--put-parent type name pos tree))
          (t
           (python-imenu--build-tree
            min-indent
            indent
            (if (<= indent children-indent-limit)
                ;; This lies within the children indent offset range,
                ;; so it's a normal child of its parent (i.e., not
                ;; a child of a child).
                (cons (cons label pos) tree)
              ;; Oh no, a child of a child?!  Fear not, we
              ;; know how to roll.  We recursively parse these by
              ;; swapping prev-indent and min-indent plus adding this
              ;; newly found item to a fresh subtree.  This works, I
              ;; promise.
              (cons
               (python-imenu--build-tree
                prev-indent indent (list (cons label pos)))
               tree)))))))

(defun python-imenu-create-index ()
  "Return tree Imenu alist for the current Python buffer.
Change `python-imenu-format-item-label-function',
`python-imenu-format-parent-item-label-function',
`python-imenu-format-parent-item-jump-label-function' to
customize how labels are formatted."
  (goto-char (point-max))
  (let ((index)
        (tree))
    (while (setq tree (python-imenu--build-tree))
      (setq index (cons tree index)))
    index))

(defun python-imenu-create-flat-index (&optional alist prefix)
  "Return flat outline of the current Python buffer for Imenu.
Optional argument ALIST is the tree to be flattened; when nil
`python-imenu-create-index' is used with
`python-imenu-format-parent-item-jump-label-function'
`python-imenu-format-parent-item-label-function'
`python-imenu-format-item-label-function' set to
  (lambda (type name) name)
Optional argument PREFIX is used in recursive calls and should
not be passed explicitly.

Converts this:

    ((\"Foo\" . 103)
     (\"Bar\" . 138)
     (\"decorator\"
      (\"decorator\" . 173)
      (\"wrap\"
       (\"wrap\" . 353)
       (\"wrapped_f\" . 393))))

To this:

    ((\"Foo\" . 103)
     (\"Bar\" . 138)
     (\"decorator\" . 173)
     (\"decorator.wrap\" . 353)
     (\"decorator.wrapped_f\" . 393))"
  ;; Inspired by imenu--flatten-index-alist removed in revno 21853.
  (apply
   #'nconc
   (mapcar
    (lambda (item)
      (let ((name (if prefix
                      (concat prefix "." (car item))
                    (car item)))
            (pos (cdr item)))
        (cond ((or (numberp pos) (markerp pos))
               (list (cons name pos)))
              ((listp pos)
               (cons
                (cons name (cdar pos))
                (python-imenu-create-flat-index (cddr item) name))))))
    (or alist
        (let* ((fn (lambda (_type name) name))
               (python-imenu-format-item-label-function fn)
              (python-imenu-format-parent-item-label-function fn)
              (python-imenu-format-parent-item-jump-label-function fn))
          (python-imenu-create-index))))))

\f
;;; Misc helpers

(defun python-info-current-defun (&optional include-type)
  "Return name of surrounding function with Python compatible dotty syntax.
Optional argument INCLUDE-TYPE indicates to include the type of the defun.
This function can be used as the value of `add-log-current-defun-function'
since it returns nil if point is not inside a defun."
  (save-restriction
    (widen)
    (save-excursion
      (end-of-line 1)
      (let ((names)
            (starting-indentation (current-indentation))
            (starting-pos (point))
            (first-run t)
            (last-indent)
            (type))
        (catch 'exit
          (while (python-nav-beginning-of-defun 1)
            (when (save-match-data
                    (and
                     (or (not last-indent)
                         (< (current-indentation) last-indent))
                     (or
                      (and first-run
                           (save-excursion
                             ;; If this is the first run, we may add
                             ;; the current defun at point.
                             (setq first-run nil)
                             (goto-char starting-pos)
                             (python-nav-beginning-of-statement)
                             (beginning-of-line 1)
                             (looking-at-p
                              python-nav-beginning-of-defun-regexp)))
                      (< starting-pos
                         (save-excursion
                           (let ((min-indent
                                  (+ (current-indentation)
                                     python-indent-offset)))
                             (if (< starting-indentation  min-indent)
                                 ;; If the starting indentation is not
                                 ;; within the min defun indent make the
                                 ;; check fail.
                                 starting-pos
                               ;; Else go to the end of defun and add
                               ;; up the current indentation to the
                               ;; ending position.
                               (python-nav-end-of-defun)
                               (+ (point)
                                  (if (>= (current-indentation) min-indent)
                                      (1+ (current-indentation))
                                    0)))))))))
              (save-match-data (setq last-indent (current-indentation)))
              (if (or (not include-type) type)
                  (setq names (cons (match-string-no-properties 1) names))
                (let ((match (split-string (match-string-no-properties 0))))
                  (setq type (car match))
                  (setq names (cons (cadr match) names)))))
            ;; Stop searching ASAP.
            (and (= (current-indentation) 0) (throw 'exit t))))
        (and names
             (concat (and type (format "%s " type))
                     (mapconcat #'identity names ".")))))))

(defun python-info-current-symbol (&optional replace-self)
  "Return current symbol using dotty syntax.
With optional argument REPLACE-SELF convert \"self\" to current
parent defun name."
  (let ((name
         (and (not (python-syntax-comment-or-string-p))
              (with-syntax-table python-dotty-syntax-table
                (let ((sym (symbol-at-point)))
                  (and sym
                       (substring-no-properties (symbol-name sym))))))))
    (when name
      (if (not replace-self)
          name
        (let ((current-defun (python-info-current-defun)))
          (if (not current-defun)
              name
            (replace-regexp-in-string
             (python-rx line-start word-start "self" word-end ?.)
             (concat
              (mapconcat #'identity
                         (butlast (split-string current-defun "\\."))
                         ".")
              ".")
             name)))))))

(defun python-info-statement-starts-block-p ()
  "Return non-nil if current statement opens a block."
  (save-excursion
    (python-nav-beginning-of-statement)
    (looking-at (python-rx block-start))))

(defun python-info-statement-ends-block-p ()
  "Return non-nil if point is at end of block."
  (let ((end-of-block-pos (save-excursion
                            (python-nav-end-of-block)))
        (end-of-statement-pos (save-excursion
                                (python-nav-end-of-statement))))
    (and end-of-block-pos end-of-statement-pos
         (= end-of-block-pos end-of-statement-pos))))

(defun python-info-beginning-of-statement-p ()
  "Return non-nil if point is at beginning of statement."
  (= (point) (save-excursion
               (python-nav-beginning-of-statement)
               (point))))

(defun python-info-end-of-statement-p ()
  "Return non-nil if point is at end of statement."
  (= (point) (save-excursion
               (python-nav-end-of-statement)
               (point))))

(defun python-info-beginning-of-block-p ()
  "Return non-nil if point is at beginning of block."
  (and (python-info-beginning-of-statement-p)
       (python-info-statement-starts-block-p)))

(defun python-info-end-of-block-p ()
  "Return non-nil if point is at end of block."
  (and (python-info-end-of-statement-p)
       (python-info-statement-ends-block-p)))

(define-obsolete-function-alias
  'python-info-closing-block
  #'python-info-dedenter-opening-block-position "24.4")

(defun python-info-dedenter-opening-block-position ()
  "Return the point of the closest block the current line closes.
Returns nil if point is not on a dedenter statement or no opening
block can be detected.  The latter case meaning current file is
likely an invalid python file."
  (let ((positions (python-info-dedenter-opening-block-positions))
        (indentation (current-indentation))
        (position))
    (while (and (not position)
                positions)
      (save-excursion
        (goto-char (car positions))
        (if (<= (current-indentation) indentation)
            (setq position (car positions))
          (setq positions (cdr positions)))))
    position))

(defun python-info-dedenter-opening-block-positions ()
  "Return points of blocks the current line may close sorted by closer.
Returns nil if point is not on a dedenter statement or no opening
block can be detected.  The latter case meaning current file is
likely an invalid python file."
  (save-excursion
    (let ((dedenter-pos (python-info-dedenter-statement-p)))
      (when dedenter-pos
        (goto-char dedenter-pos)
        (let* ((cur-line (line-beginning-position))
               (pairs '(("elif" "elif" "if")
                        ("else" "if" "elif" "except" "for" "while")
                        ("except" "except" "try")
                        ("finally" "else" "except" "try")))
               (dedenter (match-string-no-properties 0))
               (possible-opening-blocks (cdr (assoc-string dedenter pairs)))
               (collected-indentations)
               (opening-blocks))
          (catch 'exit
            (while (python-nav--syntactically
                    (lambda ()
                      (re-search-backward (python-rx block-start) nil t))
                    #'<)
              (let ((indentation (current-indentation)))
                (when (and (not (memq indentation collected-indentations))
                           (or (not collected-indentations)
                               (< indentation
                                  (apply #'min collected-indentations)))
                           ;; There must be no line with indentation
                           ;; smaller than `indentation' (except for
                           ;; blank lines) between the found opening
                           ;; block and the current line, otherwise it
                           ;; is not an opening block.
                           (save-excursion
                             (forward-line)
                             (let ((no-back-indent t))
                               (save-match-data
                                 (while (and (< (point) cur-line)
                                             (setq no-back-indent
                                                   (or (> (current-indentation) indentation)
                                                       (python-info-current-line-empty-p)
                                                       (python-info-current-line-comment-p))))
                                   (forward-line)))
                               no-back-indent)))
                  (setq collected-indentations
                        (cons indentation collected-indentations))
                  (when (member (match-string-no-properties 0)
                                possible-opening-blocks)
                    (setq opening-blocks (cons (point) opening-blocks))))
                (when (zerop indentation)
                  (throw 'exit nil)))))
          ;; sort by closer
          (nreverse opening-blocks))))))

(define-obsolete-function-alias
  'python-info-closing-block-message
  #'python-info-dedenter-opening-block-message "24.4")

(defun python-info-dedenter-opening-block-message  ()
  "Message the first line of the block the current statement closes."
  (let ((point (python-info-dedenter-opening-block-position)))
    (when point
        (message "Closes %s" (save-excursion
                               (goto-char point)
                               (buffer-substring
                                (point) (line-end-position)))))))

(defun python-info-dedenter-statement-p ()
  "Return point if current statement is a dedenter.
Sets `match-data' to the keyword that starts the dedenter
statement."
  (save-excursion
    (python-nav-beginning-of-statement)
    (when (and (not (python-syntax-context-type))
               (looking-at (python-rx dedenter)))
      (point))))

(defun python-info-line-ends-backslash-p (&optional line-number)
  "Return non-nil if current line ends with backslash.
With optional argument LINE-NUMBER, check that line instead."
  (save-excursion
      (when line-number
        (python-util-goto-line line-number))
      (while (and (not (eobp))
                  (goto-char (line-end-position))
                  (python-syntax-context 'paren)
                  (not (equal (char-before (point)) ?\\)))
        (forward-line 1))
      (when (equal (char-before) ?\\)
        (point-marker))))

(defun python-info-beginning-of-backslash (&optional line-number)
  "Return the point where the backslashed line starts.
Optional argument LINE-NUMBER forces the line number to check against."
  (save-excursion
      (when line-number
        (python-util-goto-line line-number))
      (when (python-info-line-ends-backslash-p)
        (while (save-excursion
                 (goto-char (line-beginning-position))
                 (python-syntax-context 'paren))
          (forward-line -1))
        (back-to-indentation)
        (point-marker))))

(defun python-info-continuation-line-p ()
  "Check if current line is continuation of another.
When current line is continuation of another return the point
where the continued line ends."
  (save-excursion
      (let* ((context-type (progn
                             (back-to-indentation)
                             (python-syntax-context-type)))
             (line-start (line-number-at-pos))
             (context-start (when context-type
                              (python-syntax-context context-type))))
        (cond ((equal context-type 'paren)
               ;; Lines inside a paren are always a continuation line
               ;; (except the first one).
               (python-util-forward-comment -1)
               (point-marker))
              ((member context-type '(string comment))
               ;; move forward an roll again
               (goto-char context-start)
               (python-util-forward-comment)
               (python-info-continuation-line-p))
              (t
               ;; Not within a paren, string or comment, the only way
               ;; we are dealing with a continuation line is that
               ;; previous line contains a backslash, and this can
               ;; only be the previous line from current
               (back-to-indentation)
               (python-util-forward-comment -1)
               (when (and (equal (1- line-start) (line-number-at-pos))
                          (python-info-line-ends-backslash-p))
                 (point-marker)))))))

(defun python-info-block-continuation-line-p ()
  "Return non-nil if current line is a continuation of a block."
  (save-excursion
    (when (python-info-continuation-line-p)
      (forward-line -1)
      (back-to-indentation)
      (when (looking-at (python-rx block-start))
        (point-marker)))))

(defun python-info-assignment-statement-p (&optional current-line-only)
  "Check if current line is an assignment.
With argument CURRENT-LINE-ONLY is non-nil, don't follow any
continuations, just check the if current line is an assignment."
  (save-excursion
    (let ((found nil))
      (if current-line-only
          (back-to-indentation)
        (python-nav-beginning-of-statement))
      (while (and
              (re-search-forward (python-rx not-simple-operator
                                            assignment-operator
                                            (group not-simple-operator))
                                 (line-end-position) t)
              (not found))
        (save-excursion
          ;; The assignment operator should not be inside a string.
          (backward-char (length (match-string-no-properties 1)))
          (setq found (not (python-syntax-context-type)))))
      (when found
        (skip-syntax-forward " ")
        (point-marker)))))

;; TODO: rename to clarify this is only for the first continuation
;; line or remove it and move its body to `python-indent-context'.
(defun python-info-assignment-continuation-line-p ()
  "Check if current line is the first continuation of an assignment.
When current line is continuation of another with an assignment
return the point of the first non-blank character after the
operator."
  (save-excursion
    (when (python-info-continuation-line-p)
      (forward-line -1)
      (python-info-assignment-statement-p t))))

(defun python-info-looking-at-beginning-of-defun (&optional syntax-ppss
                                                            check-statement)
  "Check if point is at `beginning-of-defun' using SYNTAX-PPSS.
When CHECK-STATEMENT is non-nil, the current statement is checked
instead of the current physical line."
  (and (not (python-syntax-context-type (or syntax-ppss (syntax-ppss))))
       (save-excursion
         (when check-statement
           (python-nav-beginning-of-statement))
         (beginning-of-line 1)
         (looking-at python-nav-beginning-of-defun-regexp))))

(defun python-info-current-line-comment-p ()
  "Return non-nil if current line is a comment line."
  (char-equal
   (or (char-after (+ (line-beginning-position) (current-indentation))) ?_)
   ?#))

(defun python-info-current-line-empty-p ()
  "Return non-nil if current line is empty, ignoring whitespace."
  (save-excursion
    (beginning-of-line 1)
    (looking-at
     (python-rx line-start (* whitespace)
                (group (* not-newline))
                (* whitespace) line-end))
    (string-equal "" (match-string-no-properties 1))))

(defun python-info-docstring-p (&optional syntax-ppss)
  "Return non-nil if point is in a docstring.
When optional argument SYNTAX-PPSS is given, use that instead of
point's current `syntax-ppss'."
  ;;; https://www.python.org/dev/peps/pep-0257/#what-is-a-docstring
  (save-excursion
    (when (and syntax-ppss (python-syntax-context 'string syntax-ppss))
      (goto-char (nth 8 syntax-ppss)))
    (python-nav-beginning-of-statement)
    (let ((counter 1)
          (indentation (current-indentation))
          (backward-sexp-point)
          (re (concat "[uU]?[rR]?"
                      (python-rx string-delimiter))))
      (when (and
             (not (python-info-assignment-statement-p))
             (looking-at-p re)
             ;; Allow up to two consecutive docstrings only.
             (>=
              2
              (let (last-backward-sexp-point)
                (while (and (<= counter 2)
                            (save-excursion
                              (python-nav-backward-sexp)
                              (setq backward-sexp-point (point))
                              (and (= indentation (current-indentation))
                                   ;; Make sure we're always moving point.
                                   ;; If we get stuck in the same position
                                   ;; on consecutive loop iterations,
                                   ;; bail out.
                                   (prog1 (not (eql last-backward-sexp-point
                                                    backward-sexp-point))
                                     (setq last-backward-sexp-point
                                           backward-sexp-point))
                                   (looking-at-p
                                    (concat "[uU]?[rR]?"
                                            (python-rx string-delimiter))))))
                  ;; Previous sexp was a string, restore point.
                  (goto-char backward-sexp-point)
                  (cl-incf counter))
                counter)))
        (python-util-forward-comment -1)
        (python-nav-beginning-of-statement)
        (cond ((bobp))
              ((python-info-assignment-statement-p) t)
              ((python-info-looking-at-beginning-of-defun))
              (t nil))))))

(defun python-info-encoding-from-cookie ()
  "Detect current buffer's encoding from its coding cookie.
Returns the encoding as a symbol."
  (let ((first-two-lines
         (save-excursion
           (save-restriction
             (widen)
             (goto-char (point-min))
             (forward-line 2)
             (buffer-substring-no-properties
              (point)
              (point-min))))))
    (when (string-match (python-rx coding-cookie) first-two-lines)
      (intern (match-string-no-properties 1 first-two-lines)))))

(defun python-info-encoding ()
  "Return encoding for file.
Try `python-info-encoding-from-cookie', if none is found then
default to utf-8."
  ;; If no encoding is defined, then it's safe to use UTF-8: Python 2
  ;; uses ASCII as default while Python 3 uses UTF-8.  This means that
  ;; in the worst case scenario python.el will make things work for
  ;; Python 2 files with unicode data and no encoding defined.
  (or (python-info-encoding-from-cookie)
      'utf-8))

\f
;;; Utility functions

(defun python-util-goto-line (line-number)
  "Move point to LINE-NUMBER."
  (goto-char (point-min))
  (forward-line (1- line-number)))

;; Stolen from org-mode
(defun python-util-clone-local-variables (from-buffer &optional regexp)
  "Clone local variables from FROM-BUFFER.
Optional argument REGEXP selects variables to clone and defaults
to \"^python-\"."
  (mapc
   (lambda (pair)
     (and (symbolp (car pair))
          (string-match (or regexp "^python-")
                        (symbol-name (car pair)))
          (set (make-local-variable (car pair))
               (cdr pair))))
   (buffer-local-variables from-buffer)))

(defvar comint-last-prompt-overlay)     ; Shut up, byte compiler.

(defun python-util-comint-last-prompt ()
  "Return comint last prompt overlay start and end.
This is for compatibility with Emacs < 24.4."
  (cond ((bound-and-true-p comint-last-prompt-overlay)
         (cons (overlay-start comint-last-prompt-overlay)
               (overlay-end comint-last-prompt-overlay)))
        ((bound-and-true-p comint-last-prompt)
         comint-last-prompt)
        (t nil)))

(defun python-util-forward-comment (&optional direction)
  "Python mode specific version of `forward-comment'.
Optional argument DIRECTION defines the direction to move to."
  (let ((comment-start (python-syntax-context 'comment))
        (factor (if (< (or direction 0) 0)
                    -99999
                  99999)))
    (when comment-start
      (goto-char comment-start))
    (forward-comment factor)))

(defun python-util-list-directories (directory &optional predicate max-depth)
  "List DIRECTORY subdirs, filtered by PREDICATE and limited by MAX-DEPTH.
Argument PREDICATE defaults to `identity' and must be a function
that takes one argument (a full path) and returns non-nil for
allowed files.  When optional argument MAX-DEPTH is non-nil, stop
searching when depth is reached, else don't limit."
  (let* ((dir (expand-file-name directory))
         (dir-length (length dir))
         (predicate (or predicate #'identity))
         (to-scan (list dir))
         (tally nil))
    (while to-scan
      (let ((current-dir (car to-scan)))
        (when (funcall predicate current-dir)
          (setq tally (cons current-dir tally)))
        (setq to-scan (append (cdr to-scan)
                              (python-util-list-files
                               current-dir #'file-directory-p)
                              nil))
        (when (and max-depth
                   (<= max-depth
                       (length (split-string
                                (substring current-dir dir-length)
                                "/\\|\\\\" t))))
          (setq to-scan nil))))
    (nreverse tally)))

(defun python-util-list-files (dir &optional predicate)
  "List files in DIR, filtering with PREDICATE.
Argument PREDICATE defaults to `identity' and must be a function
that takes one argument (a full path) and returns non-nil for
allowed files."
  (let ((dir-name (file-name-as-directory dir)))
    (apply #'nconc
           (mapcar (lambda (file-name)
                     (let ((full-file-name
                            (expand-file-name file-name dir-name)))
                       (when (and
                              (not (member file-name '("." "..")))
                              (funcall (or predicate #'identity)
                                       full-file-name))
                         (list full-file-name))))
                   (directory-files dir-name)))))

(defun python-util-list-packages (dir &optional max-depth)
  "List packages in DIR, limited by MAX-DEPTH.
When optional argument MAX-DEPTH is non-nil, stop searching when
depth is reached, else don't limit."
  (let* ((dir (expand-file-name dir))
         (parent-dir (file-name-directory
                      (directory-file-name
                       (file-name-directory
                        (file-name-as-directory dir)))))
         (subpath-length (length parent-dir)))
    (mapcar
     (lambda (file-name)
       (replace-regexp-in-string
        (rx (or ?\\ ?/)) "." (substring file-name subpath-length)))
     (python-util-list-directories
      (directory-file-name dir)
      (lambda (dir)
        (file-exists-p (expand-file-name "__init__.py" dir)))
      max-depth))))

(defun python-util-popn (lst n)
  "Return LST first N elements.
N should be an integer, when negative its opposite is used.
When N is bigger than the length of LST, the list is
returned as is."
  (let* ((n (min (abs n)))
         (len (length lst))
         (acc))
    (if (> n len)
        lst
      (while (< 0 n)
        (setq acc (cons (car lst) acc)
              lst (cdr lst)
              n (1- n)))
      (reverse acc))))

(defun python-util-strip-string (string)
  "Strip STRING whitespace and newlines from end and beginning."
  (replace-regexp-in-string
   (rx (or (: string-start (* (any whitespace ?\r ?\n)))
           (: (* (any whitespace ?\r ?\n)) string-end)))
   ""
   string))

(defun python-util-valid-regexp-p (regexp)
  "Return non-nil if REGEXP is valid."
  (ignore-errors (string-match regexp "") t))

\f
;;; Flymake integration

(defgroup python-flymake nil
  "Integration between Python and Flymake."
  :group 'python
  :link '(custom-group-link :tag "Flymake" flymake)
  :version "26.1")

(defcustom python-flymake-command '("pyflakes")
  "The external tool that will be used to perform the syntax check.
This is a non empty list of strings, the checker tool possibly followed by
required arguments.  Once launched it will receive the Python source to be
checked as its standard input.
To use `flake8' you would set this to (\"flake8\" \"-\")."
  :version "26.1"
  :type '(repeat string))

;; The default regexp accommodates for older pyflakes, which did not
;; report the column number, and at the same time it's compatible with
;; flake8 output, although it may be redefined to explicitly match the
;; TYPE
(defcustom python-flymake-command-output-pattern
  (list
   "^\\(?:<?stdin>?\\):\\(?1:[0-9]+\\):\\(?:\\(?2:[0-9]+\\):\\)? \\(?3:.*\\)$"
   1 2 nil 3)
  "Specify how to parse the output of `python-flymake-command'.
The value has the form (REGEXP LINE COLUMN TYPE MESSAGE): if
REGEXP matches, the LINE'th subexpression gives the line number,
the COLUMN'th subexpression gives the column number on that line,
the TYPE'th subexpression gives the type of the message and the
MESSAGE'th gives the message text itself.

If COLUMN or TYPE are nil or that index didn't match, that
information is not present on the matched line and a default will
be used."
  :version "26.1"
  :type '(list regexp
               (integer :tag "Line's index")
               (choice
                (const :tag "No column" nil)
                (integer :tag "Column's index"))
               (choice
                (const :tag "No type" nil)
                (integer :tag "Type's index"))
               (integer :tag "Message's index")))

(defcustom python-flymake-msg-alist
  '(("\\(^redefinition\\|.*unused.*\\|used$\\)" . :warning))
  "Alist used to associate messages to their types.
Each element should be a cons-cell (REGEXP . TYPE), where TYPE
should be a diagnostic type symbol like `:error', `:warning' or
`:note'.  For example, when using `flake8' a possible
configuration could be:

  ((\"\\(^redefinition\\|.*unused.*\\|used$\\)\" . :warning)
   (\"^E999\" . :error)
   (\"^[EW][0-9]+\" . :note))

By default messages are considered errors."
  :version "26.1"
  :type '(alist :key-type (regexp)
                :value-type (symbol)))

(defvar-local python--flymake-proc nil)

(defun python--flymake-parse-output (source proc report-fn)
  "Collect diagnostics parsing checker tool's output line by line."
  (let ((rx (nth 0 python-flymake-command-output-pattern))
        (lineidx (nth 1 python-flymake-command-output-pattern))
        (colidx (nth 2 python-flymake-command-output-pattern))
        (typeidx (nth 3 python-flymake-command-output-pattern))
        (msgidx (nth 4 python-flymake-command-output-pattern)))
    (with-current-buffer (process-buffer proc)
      (goto-char (point-min))
      (cl-loop
       while (search-forward-regexp rx nil t)
       for msg = (match-string msgidx)
       for (beg . end) = (flymake-diag-region
                          source
                          (string-to-number
                           (match-string lineidx))
                          (and colidx
                               (match-string colidx)
                               (string-to-number
                                (match-string colidx))))
       for type = (or (and typeidx
                           (match-string typeidx)
                           (assoc-default
                            (match-string typeidx)
                            python-flymake-msg-alist
                            #'string-match))
                      (assoc-default msg
                                     python-flymake-msg-alist
                                     #'string-match)
                      :error)
       collect (flymake-make-diagnostic
                source beg end type msg)
       into diags
       finally (funcall report-fn diags)))))

(defun python-flymake (report-fn &rest _args)
  "Flymake backend for Python.
This backend uses `python-flymake-command' (which see) to launch a process
that is passed the current buffer's content via stdin.
REPORT-FN is Flymake's callback function."
  (unless (executable-find (car python-flymake-command))
    (error "Cannot find a suitable checker"))

  (when (process-live-p python--flymake-proc)
    (kill-process python--flymake-proc))

  (let ((source (current-buffer)))
    (save-restriction
      (widen)
      (setq python--flymake-proc
            (make-process
             :name "python-flymake"
             :noquery t
             :connection-type 'pipe
             :buffer (generate-new-buffer " *python-flymake*")
             :command python-flymake-command
             :sentinel
             (lambda (proc _event)
               (when (eq 'exit (process-status proc))
                 (unwind-protect
                     (when (with-current-buffer source
                             (eq proc python--flymake-proc))
                       (python--flymake-parse-output source proc report-fn))
                   (kill-buffer (process-buffer proc)))))))
      (process-send-region python--flymake-proc (point-min) (point-max))
      (process-send-eof python--flymake-proc))))

\f
(defun python-electric-pair-string-delimiter ()
  (when (and electric-pair-mode
             (memq last-command-event '(?\" ?\'))
             (let ((count 0))
               (while (eq (char-before (- (point) count)) last-command-event)
                 (cl-incf count))
               (= count 3))
             (eq (char-after) last-command-event))
    (save-excursion (insert (make-string 2 last-command-event)))))

(defvar electric-indent-inhibit)
(defvar prettify-symbols-alist)

;;;###autoload
(define-derived-mode python-mode prog-mode "Python"
  "Major mode for editing Python files.

\\{python-mode-map}"
  (setq-local tab-width 8)
  (setq-local indent-tabs-mode nil)

  (setq-local comment-start "# ")
  (setq-local comment-start-skip "#+\\s-*")

  (setq-local parse-sexp-lookup-properties t)
  (setq-local parse-sexp-ignore-comments t)

  (setq-local forward-sexp-function python-forward-sexp-function)

  (setq-local font-lock-defaults
              `(,python-font-lock-keywords
                nil nil nil nil
                (font-lock-syntactic-face-function
                 . python-font-lock-syntactic-face-function)))

  (setq-local syntax-propertize-function
              python-syntax-propertize-function)

  (setq-local indent-line-function #'python-indent-line-function)
  (setq-local indent-region-function #'python-indent-region)
  ;; Because indentation is not redundant, we cannot safely reindent code.
  (setq-local electric-indent-inhibit t)
  (setq-local electric-indent-chars
              (cons ?: electric-indent-chars))

  ;; Add """ ... """ pairing to electric-pair-mode.
  (add-hook 'post-self-insert-hook
            #'python-electric-pair-string-delimiter 'append t)

  (setq-local paragraph-start "\\s-*$")
  (setq-local fill-paragraph-function #'python-fill-paragraph)
  (setq-local normal-auto-fill-function #'python-do-auto-fill)

  (setq-local beginning-of-defun-function #'python-nav-beginning-of-defun)
  (setq-local end-of-defun-function #'python-nav-end-of-defun)

  (add-hook 'completion-at-point-functions
            #'python-completion-at-point nil 'local)

  (add-hook 'post-self-insert-hook
            #'python-indent-post-self-insert-function 'append 'local)

  (setq-local imenu-create-index-function
              #'python-imenu-create-index)

  (setq-local add-log-current-defun-function
              #'python-info-current-defun)

  (add-hook 'which-func-functions #'python-info-current-defun nil t)

  (setq-local skeleton-further-elements
              '((abbrev-mode nil)
                (< '(backward-delete-char-untabify (min python-indent-offset
                                                        (current-column))))
                (^ '(- (1+ (current-indentation))))))

  (with-no-warnings
    ;; suppress warnings about eldoc-documentation-function being obsolete
   (if (null eldoc-documentation-function)
       ;; Emacs<25
       (setq-local eldoc-documentation-function #'python-eldoc-function)
     (if (boundp 'eldoc-documentation-functions)
         (add-hook 'eldoc-documentation-functions #'python-eldoc-function nil t)
       (add-function :before-until (local 'eldoc-documentation-function)
                     #'python-eldoc-function))))

  (add-to-list
   'hs-special-modes-alist
   '(python-mode
     "\\s-*\\_<\\(?:def\\|class\\)\\_>"
     ;; Use the empty string as end regexp so it doesn't default to
     ;; "\\s)".  This way parens at end of defun are properly hidden.
     ""
     "#"
     python-hideshow-forward-sexp-function
     nil))

  (setq-local outline-regexp (python-rx (* space) block-start))
  (setq-local outline-heading-end-regexp ":[^\n]*\n")
  (setq-local outline-level
              (lambda ()
                "`outline-level' function for Python mode."
                (1+ (/ (current-indentation) python-indent-offset))))

  (setq-local prettify-symbols-alist python-prettify-symbols-alist)

  (python-skeleton-add-menu-items)

  (make-local-variable 'python-shell-internal-buffer)

  (when python-indent-guess-indent-offset
    (python-indent-guess-indent-offset))

  (add-hook 'flymake-diagnostic-functions #'python-flymake nil t))


(provide 'python)

;; Local Variables:
;; indent-tabs-mode: nil
;; End:

;;; python.el ends here

debug log:

solving bbdd2a9502 ...
found bbdd2a9502 in https://yhetil.org/emacs-bugs/874jyr87ux.fsf@gmail.com/
found b8fc7d4c54 in https://git.savannah.gnu.org/cgit/emacs.git
preparing index
index prepared:
100644 b8fc7d4c5468ad47dd9fce2e29c744f195b53e05	lisp/progmodes/python.el

applying [1/1] https://yhetil.org/emacs-bugs/874jyr87ux.fsf@gmail.com/
diff --git a/lisp/progmodes/python.el b/lisp/progmodes/python.el
index b8fc7d4c54..bbdd2a9502 100644

Checking patch lisp/progmodes/python.el...
Applied patch lisp/progmodes/python.el cleanly.

index at:
100644 bbdd2a9502c804afab4e049adf0071af68782c0d	lisp/progmodes/python.el

(*) Git path names are given by the tree(s) the blob belongs to.
    Blobs themselves have no identifier aside from the hash of its contents.^

Code repositories for project(s) associated with this public inbox

	https://git.savannah.gnu.org/cgit/emacs.git

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for read-only IMAP folder(s) and NNTP newsgroup(s).