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Code Issues Projects Releases Packages Wiki Activity Actions 11

gh-132493: lazy evaluation of annotations in typing._proto_hook (#132534)

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Co-authored-by: Jelle Zijlstra <jelle.zijlstra@gmail.com>
Co-authored-by: sobolevn <mail@sobolevn.me>
Co-authored-by: Alex Waygood <Alex.Waygood@Gmail.com>
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Felix Scherz 2025-04-16 17:20:35 +02:00 • committed by GitHub
parent 014c7f9047
commit 71af090e24
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3 changed files with 38 additions and 4 deletions
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11
Lib/typing.py
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@ -2020,10 +2020,13 @@ def _proto_hook(cls, other):
break
# ...or in annotations, if it is a sub-protocol.
annotations = getattr(base, '__annotations__', {})
if (isinstance(annotations, collections.abc.Mapping) and
attr in annotations and
issubclass(other, Generic) and getattr(other, '_is_protocol', False)):
if (
issubclass(other, Generic)
and getattr(other, "_is_protocol", False)
and attr in _lazy_annotationlib.get_annotations(
base, format=_lazy_annotationlib.Format.FORWARDREF
)
):
break
else:
return NotImplemented