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gh-130881: Handle conditionally defined annotations#130935

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JelleZijlstra merged 11 commits intopython:mainfrom
JelleZijlstra:conditional-anno
Mar 26, 2025
Merged

gh-130881: Handle conditionally defined annotations#130935
JelleZijlstra merged 11 commits intopython:mainfrom
JelleZijlstra:conditional-anno

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@JelleZijlstra
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@JelleZijlstraJelleZijlstra commentedMar 7, 2025•
edited by bedevere-appbot
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@JelleZijlstra
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Thanks@picnixz@tomasr8 for the reviews, please take another look!

@picnixzpicnixz self-requested a reviewMarch 12, 2025 14:42
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I won't force you to followPEP-7 as the file has a mix of everything which makes it very hard to choose a convention. You can also ignore my suggestion insymtable.c if you think it's not necessary and if the surrounding code is using the same writing style.

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I think I reviewed the changes, though I'm not entirely sure about the tests themselves so another eye is welcome

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Once this is merged, should the text in PEP 649 be updated to reflect this change?

Code that sets annotations on module or class attributes from inside any kind of flow control statement. It’s currently possible to set module and class attributes with annotations inside an if or try statement, and it works as one would expect. It’s untenable to support this behavior when this PEP is active.

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Co-authored-by: Bénédikt Tran <10796600+picnixz@users.noreply.github.com>
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Just some comments/questions for the tests, otherwise looks good :)

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Once this is merged, should the text in PEP 649 be updated to reflect this change?

Code that sets annotations on module or class attributes from inside any kind of flow control statement. It’s currently possible to set module and class attributes with annotations inside an if or try statement, and it works as one would expect. It’s untenable to support this behavior when this PEP is active.

I don't own PEP 649 so I can't update it. Could add it to PEP 749 but I already submitted it to the SC.

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Thanks! Looks good to me :)

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Once this is merged, should the text in PEP 649 be updated to reflect this change?

Code that sets annotations on module or class attributes from inside any kind of flow control statement. It’s currently possible to set module and class attributes with annotations inside an if or try statement, and it works as one would expect. It’s untenable to support this behavior when this PEP is active.

I don't own PEP 649 so I can't update it. Could add it to PEP 749 but I already submitted it to the SC.

Larry is the owner.@larryhastings should the PEP be updated?

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Accepted PEPs are historical documents; as a rule I'm averse to changing them after they're accepted. PEP 749 is the perfect place to document this change to what's specified in 649.

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Two nits I missed but otherwise, looks good to me

Co-authored-by: Bénédikt Tran <10796600+picnixz@users.noreply.github.com>
Co-authored-by: Bénédikt Tran <10796600+picnixz@users.noreply.github.com>
@JelleZijlstraJelleZijlstraenabled auto-merge (squash)March 26, 2025 03:21
@JelleZijlstraJelleZijlstra merged commit898e6b3 intopython:mainMar 26, 2025
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diegorusso pushed a commit to diegorusso/cpython that referenced this pull requestApr 1, 2025
JelleZijlstra pushed a commit to python/mypy that referenced this pull requestDec 10, 2025
On Python 3.14, this module attribute seems to exist in certainsituations:```pycon>>> if True:...     a: str...     >>> __conditional_annotations__{0}```It's a pretty esoteric attribute without any documentation. It seems tohave been added inpython/cpython#130935Either way, stubtest was complaining about it in scipy-stubs. So allthings considered, I figured it'd be best to just ignore it.
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@tomasr8tomasr8tomasr8 approved these changes

@picnixzpicnixzpicnixz approved these changes

@carljmcarljmAwaiting requested review from carljmcarljm is a code owner

@markshannonmarkshannonAwaiting requested review from markshannonmarkshannon is a code owner

@iritkatrieliritkatrielAwaiting requested review from iritkatrieliritkatriel is a code owner

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@JelleZijlstra@tomasr8@larryhastings@picnixz

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