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gh-104555: Runtime-checkable protocols: Don't let previous calls to isinstance() influence whether issubclass() raises an exception #104559

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Merged
AlexWaygood merged 12 commits into from
May 17, 2023
Merged

gh-104555: Runtime-checkable protocols: Don't let previous calls to isinstance() influence whether issubclass() raises an exception #104559

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gh-104555: Sidestep the ABCMeta.__instancecheck__ cache in typing._Pr…
AlexWaygood May 16, 2023
f3a4551
Simplify test
AlexWaygood May 16, 2023
714badc
Optimise
AlexWaygood May 16, 2023
04ed974
who needs codespell when we have carl
AlexWaygood May 16, 2023
9c5c75f
Merge branch 'fix-runtime-protocols' of https://github.com/AlexWaygoo…
AlexWaygood May 16, 2023
49373a9
be more careful
AlexWaygood May 16, 2023
e114fe9
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AlexWaygood May 16, 2023
b5cc9cd
Add more failing tests (thanks sunmy2019!)
AlexWaygood May 17, 2023
5f72b82
Better fix
AlexWaygood May 17, 2023
bb56e13
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AlexWaygood May 17, 2023
430cacd
📜🤖 Added by blurb_it.
blurb-it[bot] May 17, 2023
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Apply suggestions from code review
AlexWaygood May 17, 2023
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@AlexWaygood
AlexWaygood committed May 16, 2023
commit e114fe95049ef27f36774fbc9d17436b4a9343fd
1 change: 1 addition & 0 deletions Lib/typing.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1805,6 +1805,7 @@ def __instancecheck__(cls, instance):
return True

if is_protocol_cls:
# Fast path for protocols with only callable members
if cls.__callable_proto_members_only__ and issubclass(type(instance), cls):
return True

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