Hi, If PDB is active in the Python Shell buffer, PDB commands such as "tbreak" are completed. While this is adequate in Python Shell buffer, PDB commands should not be completed in Python buffer: 1. emacs -Q 2. Open the following Python file. #+begin_src python import pdb pdb.set_trace() print("Hello") #+end_src 3. C-u -1 M-x eldoc-mode (Disable ElDoc mode. This step can be skipped if the fix for #58389 which is already merged in master branch is applied.) 4. C-c C-p (M-x run-python) 5. C-x o (Back to the Python mode buffer) 6. C-c C-c (M-x python-shell-send-buffer) 7. Make sure that "(Pdb)" prompt is displayed in the Python Shell buffer. 5. C-x o (Back to the Python mode buffer) 7. M-> (M-x end-of-buffer) 8. Type "t" 9. C-M-i (M-x completion-at-point) 10. "tbreak" is completed. Attached is a patch to disable completion in the Python buffer when PDB is active in the Python Shell buffer. Best Regards, -- In GNU Emacs 29.0.50 (build 7, x86_64-pc-linux-gnu, X toolkit, cairo version 1.16.0, Xaw scroll bars) of 2022-10-15 built on ubuntu Repository revision: a06c54209499c3885c13a8d3eba7798ab3f0d688 Repository branch: master System Description: Ubuntu 22.04.1 LTS Configured using: 'configure --without-libgmp' Configured features: ACL CAIRO FREETYPE GIF GLIB GNUTLS GSETTINGS HARFBUZZ JPEG LIBSELINUX LIBXML2 MODULES NOTIFY INOTIFY PDUMPER PNG SECCOMP SOUND SQLITE3 THREADS TIFF TOOLKIT_SCROLL_BARS X11 XDBE XIM XPM LUCID ZLIB Important settings: value of $LANG: en_US.UTF-8 locale-coding-system: utf-8-unix Major mode: Python Minor modes in effect: tooltip-mode: t global-eldoc-mode: t eldoc-mode: t show-paren-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 line-number-mode: t transient-mark-mode: t auto-composition-mode: t auto-encryption-mode: t auto-compression-mode: t Load-path shadows: None found. Features: (shadow sort mail-extr emacsbug message mailcap yank-media puny dired dired-loaddefs rfc822 mml mml-sec password-cache epa derived epg rfc6068 epg-config gnus-util text-property-search time-date mm-decode mm-bodies mm-encode mail-parse rfc2231 mailabbrev gmm-utils mailheader sendmail rfc2047 rfc2045 ietf-drums mm-util mail-prsvr mail-utils vc-hg vc-git diff-mode vc-bzr vc-src vc-sccs vc-svn vc-cvs vc-rcs log-view easy-mmode pcvs-util vc vc-dispatcher python json subr-x map project comint ansi-osc ring cl-loaddefs cl-lib ansi-color term/screen term/xterm xterm byte-opt gv bytecomp byte-compile cconv rmc iso-transl tooltip eldoc paren electric uniquify ediff-hook vc-hooks lisp-float-type elisp-mode mwheel term/x-win x-win term/common-win x-dnd tool-bar dnd fontset image regexp-opt fringe tabulated-list replace newcomment text-mode lisp-mode prog-mode register page tab-bar menu-bar rfn-eshadow isearch easymenu timer select scroll-bar mouse jit-lock font-lock syntax font-core term/tty-colors frame minibuffer nadvice seq simple cl-generic indonesian philippine cham georgian utf-8-lang misc-lang vietnamese tibetan thai tai-viet lao korean japanese eucjp-ms cp51932 hebrew greek romanian slovak czech european ethiopic indian cyrillic chinese composite emoji-zwj charscript charprop case-table epa-hook jka-cmpr-hook help abbrev obarray oclosure cl-preloaded button loaddefs faces cus-face macroexp files window text-properties overlay sha1 md5 base64 format env code-pages mule custom widget keymap hashtable-print-readable backquote threads inotify dynamic-setting system-font-setting font-render-setting cairo x-toolkit x multi-tty make-network-process emacs) Memory information: ((conses 16 66940 7163) (symbols 48 8205 0) (strings 32 23930 1490) (string-bytes 1 694497) (vectors 16 13452) (vector-slots 8 155649 7354) (floats 8 31 357) (intervals 56 229 0) (buffers 1000 12))