Description

sobolevn

opened on Feb 13, 2023

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The co_lnotab attribute will be deprecated in 3.10 and removed in 3.12.

https://peps.python.org/pep-0626/#backwards-compatibility

It was documented as deprecated in 3.10 and to-be-removed in 3.12: https://docs.python.org/3/whatsnew/3.10.html#pep-626-precise-line-numbers-for-debugging-and-other-tools

Original issue: #86412

Right now CPython does not use co_lnotab in its source code.
But, there are two mentions of it:

1. In gdb:

   cpython/Misc/gdbinit

   Lines 60 to 61 in 6ef6915

   	set $__sz = ((PyVarObject *)$__co->co_lnotab)->ob_size/2
   	set $__p = (unsigned char *)((PyBytesObject *)$__co->co_lnotab)->ob_sval

   And I have no idea how it works! Some weird mix of C and some kind of a DSL / scripting language
2. In clinic.test:

   cpython/Lib/test/clinic.test

   Line 3575 in 6ef6915

   co_lnotab: PyBytesObject(c_default="(PyBytesObject *)self->co_lnotab") = None

   But, this is just a string-based test. So, I think it can stay there

If that's fine - I would like to do the honours.

CC @markshannon

Linked PRs

• gh-101865: Deprecate co_lnotab from code objects as per PEP 626 #101866
• gh-101865: Docs: Keep co_lnotab deprecation for at least 3.14 #126392
• [3.13] gh-101865: Docs: Keep co_lnotab deprecation for at least 3.14 (GH-126392) #126403
• [3.12] gh-101865: Docs: Keep co_lnotab deprecation for at least 3.14 (GH-126392) #126404

Activity

1. sobolevn

   added

   type-featureA feature request or enhancementA feature request or enhancement

   interpreter-core(Objects, Python, Grammar, and Parser dirs)(Objects, Python, Grammar, and Parser dirs)

   3.12only security fixesonly security fixes

   on Feb 13, 2023
2. sobolevn

   self-assigned this

   on Feb 13, 2023
3. sobolevn

   added a commit that references this issue on Feb 13, 2023

   pythongh-101865: Remove deprecated `co_lnotab` from code objects as p…

   808950a
4. markshannon commented on Feb 21, 2023

   

   markshannon

   on Feb 21, 2023

   Member

   More actions

   I don't get any warning when using co_lnotab in 3.11, so I don't think we can remove it yet.
   Don't assume everyone has read PEP 626.

   We should at least warn when using it for a couple of versions, before removing it.

   It isn't causing us any problems either, so there is not rush to remove it. It can wait for 3.14 or so.
5. sobolevn commented on Feb 21, 2023

   

   sobolevn

   on Feb 21, 2023

   MemberAuthor

   More actions

   Ok then, so DeprecationWarning it is! 👍
6. sobolevn

   added 2 commits that reference this issue on Feb 21, 2023

   pythongh-101865: Remove deprecated `co_lnotab` from code objects as p…

   06a79d9

   Revert "pythongh-101865: Remove deprecated `co_lnotab` from code obje…

   dd65849
7. hugovk

   changed the title [-]`co_lnotab` must be removed in 3.12 according to PEP626[/-] [+]`co_lnotab` must be removed in 3.12 according to PEP 626[/+] on Mar 18, 2023
8. ambv

   added a commit that references this issue on Apr 3, 2023

   gh-101865: Deprecate `co_lnotab` from code objects as per PEP 626 (#1…

   2a72125
9. iritkatriel

   closed this as completedon Apr 4, 2023
10. gaogaotiantian

    added a commit that references this issue on Apr 8, 2023

    pythongh-101865: Deprecate `co_lnotab` from code objects as per PEP 6…

    726a56e
11. warsaw

    added a commit that references this issue on Apr 11, 2023

    pythongh-101865: Deprecate `co_lnotab` from code objects as per PEP 6…

    2db2a84
12. hugovk

    added 5 commits that reference this issue on Nov 4, 2024

    gh-101865: Docs: Keep co_lnotab deprecation for at least 3.14 (#126392)

    eac41c5

    [3.13] pythongh-101865: Docs: Keep co_lnotab deprecation for at least…

    5ee730c

    [3.12] pythongh-101865: Docs: Keep co_lnotab deprecation for at least…

    5e90e7f

    [3.13] gh-101865: Docs: Keep co_lnotab deprecation for at least 3.14 (G…

    cccc066

    [3.12] gh-101865: Docs: Keep co_lnotab deprecation for at least 3.14 (G…

    94423b6
13. picnixz

    added a commit that references this issue on Dec 8, 2024

    pythongh-101865: Docs: Keep co_lnotab deprecation for at least 3.14 (p…

    d0fd8f0
14. ebonnal

    added a commit that references this issue on Jan 12, 2025

    pythongh-101865: Docs: Keep co_lnotab deprecation for at least 3.14 (p…

    f24d2e6

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