bug#22643: 24.5; Double import on completion in python mode

bug#22643: 24.5; Double import on completion in python mode

[vsuharnikov]

Steps for reproduce:
* start emacs: emacs -Q
* create an empty python buffer: C-x b foo.py RET
* turn on python mode: M-x python-mode RET
* start interpreter: C-c C-z (python-shell-switch-to-shell) and answer the 
prompts (I pressed RET n)
* switch back to python buffer: C-x o (other-window)
* type "from os import " (there is a space after "import")
* press C-M-i (completion-at-point)

Observed behaviour: "import " is inserted in the buffer. The buffer now 
contains "from os import import ".
Expected behaviour: completion-at-point offers names from the os module 
as completion candidates.



In GNU Emacs 24.5.1 (x86_64-pc-linux-gnu, GTK+ Version 2.24.29)
 of 2016-01-26 on fort_dey
Windowing system distributor `The X.Org Foundation', version 11.0.11800000
System Description:	Gentoo Base System release 2.2

Configured using:
 `configure --prefix=/usr --build=x86_64-pc-linux-gnu
 --host=x86_64-pc-linux-gnu --mandir=/usr/share/man
 --infodir=/usr/share/info --datadir=/usr/share --sysconfdir=/etc
 --localstatedir=/var/lib --disable-dependency-tracking
 --disable-silent-rules --libdir=/usr/lib64 --program-suffix=-emacs-24
 --infodir=/usr/share/info/emacs-24 --localstatedir=/var
 --enable-locallisppath=/etc/emacs:/usr/share/emacs/site-lisp
 --with-gameuser=:gamestat --without-compress-install
 --with-file-notification=inotify --enable-acl --with-dbus
 --without-gnutls --with-gpm --without-hesiod --without-kerberos
 --without-kerberos5 --without-xml2 --without-selinux --without-wide-int
 --with-zlib --with-sound=alsa --with-x --without-ns --without-gconf
 --without-gsettings --without-toolkit-scroll-bars --with-gif
 --with-jpeg --with-png --with-rsvg --with-tiff --with-xpm
 --without-imagemagick --with-xft --without-libotf --without-m17n-flt
 --with-x-toolkit=gtk2 GENTOO_PACKAGE=app-editors/emacs-24.5-r1
 'CFLAGS=-march=native -O2 -pipe -nopie' CPPFLAGS= 'LDFLAGS=-Wl,-O1
 -Wl,--as-needed''

Important settings:
  value of $LC_ALL: 
  value of $LANG: ru_RU.utf8
  locale-coding-system: utf-8-unix

Major mode: Python

Minor modes in effect:
  tooltip-mode: t
  electric-indent-mode: t
  mouse-wheel-mode: t
  tool-bar-mode: t
  menu-bar-mode: t
  file-name-shadow-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  blink-cursor-mode: t
  auto-composition-mode: t
  auto-encryption-mode: t
  auto-compression-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent messages:
C-x C-g is undefined
Quit [3 times]
Make dedicated process? (y or n) n
Sent python-shell-completion-setup-code
Sent python-ffap-setup-code
Sent python-eldoc-setup-code
No match
Making completion list...
Quit
Making completion list...

Load-path shadows:
None found.

Features:
(shadow sort gnus-util mail-extr emacsbug message format-spec rfc822 mml
mml-sec mm-decode mm-bodies mm-encode mail-parse rfc2231 mailabbrev
gmm-utils mailheader sendmail rfc2047 rfc2045 ietf-drums mm-util
help-fns mail-prsvr mail-utils compile cl-extra help-mode python
easymenu json comint ring cl-loaddefs cl-lib ansi-color time-date
cyril-util tooltip electric uniquify ediff-hook vc-hooks lisp-float-type
mwheel x-win x-dnd tool-bar dnd fontset image regexp-opt fringe
tabulated-list newcomment lisp-mode prog-mode register page menu-bar
rfn-eshadow timer select scroll-bar mouse jit-lock font-lock syntax
facemenu font-core frame cham georgian utf-8-lang misc-lang vietnamese
tibetan thai tai-viet lao korean japanese hebrew greek romanian slovak
czech european ethiopic indian cyrillic chinese case-table epa-hook
jka-cmpr-hook help simple abbrev minibuffer nadvice loaddefs button
faces cus-face macroexp files text-properties overlay sha1 md5 base64
format env code-pages mule custom widget hashtable-print-readable
backquote make-network-process dbusbind inotify dynamic-setting
font-render-setting move-toolbar gtk x-toolkit x multi-tty emacs)

Memory information:
((conses 16 86333 7207)
 (symbols 48 18744 0)
 (miscs 40 59 199)
 (strings 32 12885 4754)
 (string-bytes 1 391566)
 (vectors 16 10730)
 (vector-slots 8 400620 7751)
 (floats 8 69 423)
 (intervals 56 343 0)
 (buffers 960 14)
 (heap 1024 13190 827))

bug#22643: bug#22638: 24.5; Double import on completion in python mode

[Lars Ingebrigtsen]

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vsuharnikov@gmail.com writes:

> Steps for reproduce:
> * start emacs: emacs -Q
> * create an empty python buffer: C-x b foo.py RET
> * turn on python mode: M-x python-mode RET
> * start interpreter: C-c C-z (python-shell-switch-to-shell) and answer the 
> prompts (I pressed RET n)
> * switch back to python buffer: C-x o (other-window)
> * type "from os import " (there is a space after "import")
> * press C-M-i (completion-at-point)
>
> Observed behaviour: "import " is inserted in the buffer. The buffer now 
> contains "from os import import ".
> Expected behaviour: completion-at-point offers names from the os module 
> as completion candidates.

I'm unable to reproduce this in Emacs 26.1-28, so I'm going to go ahead
that this has been fixed in the years since this was reported, and I'm
closing this bug report.  If you can still see this problem, please
respond to the debbugs address, and we'll reopen.

However, there seems to be a regression between 25.1 and 26.1
somewhere -- `C-M-i' doesn't give a completion at all now, and in Emacs
25.1 it used to say:


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I'm not really familiar with how completion is supposed to work here,
though -- if this is an error, then perhaps a new bug report should be
opened.

-- 
(domestic pets only, the antidote for overdose, milk.)
   bloggy blog: http://lars.ingebrigtsen.no