Deprecation warning during text completion in REPL

[WolframAlph]

Bug report

Bug description:

Define function inside REPL session:

>>> def f():pass

then try to hit TAB to get suggestions for f.__code__. and you will be left with this ugly output without suggestions:

>>> f.__code__./root/Desktop/cpython-main/Lib/rlcompleter.py:191: DeprecationWarning: co_lnotab is deprecated, use co_lines instead.
  if (value := getattr(thisobject, word, None)) is not None:

then try to access co_lnotab and you will get this warning again:

>>> f.__code__.co_lnotab
<stdin>-1:1: DeprecationWarning: co_lnotab is deprecated, use co_lines instead.

CPython versions tested on:

CPython main branch

Operating systems tested on:

No response

Linked PRs

• gh-113978: Ignore warnings on text completion inside REPL #113979
• [3.13] gh-113978: Ignore warnings on text completion inside REPL (GH-113979) #119429

[terryjreedy]

IDLE's completer uses 'dir(ob)' to get the list of (22) attribute names, including 'co_lnotab'. dir does not access the objects themselves, hence no DeprecationWarning. This issue arises because rlcompleter accesses objects in order to add suffixes such as '(' or '()'. I added a note to the IDLE issue #113978 proposing to copy rlcompleter.

[gaogaotiantian]

Are you on debug build? DeprecationWarning should be turned off on release build unless it's directly from __main__, so you should not be able to reproduce this on release build - let me know if you can.

If you can't do that, this is a much smaller issue. Personally, I don't hate warnings on debug mode. I am a bit hesitated to turn off all the warnings during text completion in REPL though.

[ambv]

Thanks! ✨ 🍰 ✨