Description

serhiy-storchaka

opened on Jul 25, 2024

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New deprecation warnings about missing or inconsistent __spec__.loader and __loader__ introduced in #86298 are emitted only for the C implementation of the warnings module. Existing errors (AttributeError or ValueError) are also only raised for the C implementation of the warnings module. See tests added in #122227.

I believe that before turning the deprecation warnings into errors, we should add warnings for the Python implementation.

cc @brettcannon, @warsaw

Linked PRs

• gh-122255: Add black box tests in test_warnings #122227
• [3.13] gh-122255: Add black box tests in test_warnings (GH-122227) #122818
• [3.12] gh-122255: Add black box tests in test_warnings (GH-122227) #122819
• gh-122255: Synchronize warnings in C and Python implementations of the warnings module #122824

Reacted by Brett Cannon

Activity

1. serhiy-storchaka

   added

   topic-importlib

   on Jul 25, 2024
2. serhiy-storchaka

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

   gh-122255: Add black box tests in test_warnings (GH-122227)

   fe13c9b
3. miss-islington

   added 2 commits that reference this issue on Aug 8, 2024

   pythongh-122255: Add black box tests in test_warnings (pythonGH-122227)

   6126b60

   pythongh-122255: Add black box tests in test_warnings (pythonGH-122227)

   2ed027a
4. serhiy-storchaka

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

   pythongh-122255: Synchronize warnings in C and Python implementations…

   ad53fe3
5. gpshead

   added a commit that references this issue on Aug 9, 2024

   [3.13] gh-122255: Add black box tests in test_warnings (GH-122227) (G…

   46f973f
6. serhiy-storchaka commented on Aug 14, 2024

   

   serhiy-storchaka

   on Aug 14, 2024

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   Tests are failed for this change, and I think this is because it exposes a flaw in the current code. Opened #123011.
7. serhiy-storchaka

   added a commit that references this issue on Aug 14, 2024

   [3.12] gh-122255: Add black box tests in test_warnings (GH-122227) (G…

   c3ee1a7
8. blhsing

   added a commit that references this issue on Aug 22, 2024

   pythongh-122255: Add black box tests in test_warnings (pythonGH-122227)

   d591fcd
9. serhiy-storchaka commented on Nov 9, 2025

   

   serhiy-storchaka

   on Nov 9, 2025

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   Note also that __spec__ is set to None for the __main__ module. If __loader__ is deprecated, what should be used for the __main__ module?
10. picnixz

    added

    type-bugAn unexpected behavior, bug, or errorAn unexpected behavior, bug, or error

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

    on Nov 9, 2025
11. serhiy-storchaka

    added a commit that references this issue on Nov 14, 2025

    gh-122255: Synchronize warnings in C and Python implementations of th…

    8deaa93
12. serhiy-storchaka

    closed this as completedon Nov 14, 2025
13. StanFromIreland

    added a commit that references this issue on Dec 6, 2025

    pythongh-122255: Synchronize warnings in C and Python implementations…

    a3a3bb3

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