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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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2601138
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
Add comment
AlexWaygood May 16, 2023
b5cc9cd
Add more failing tests (thanks sunmy2019!)
AlexWaygood May 17, 2023
5f72b82
Better fix
AlexWaygood May 17, 2023
bb56e13
Improve comments
AlexWaygood May 17, 2023
430cacd
📜🤖 Added by blurb_it.
blurb-it[bot] May 17, 2023
f9273fc
Apply suggestions from code review
AlexWaygood May 17, 2023
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4 changes: 2 additions & 2 deletions Lib/test/test_typing.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2665,7 +2665,7 @@ def __init__(self) -> None:

# gh-104555: ABCMeta might cache the result of this isinstance check
# if we called super().__instancecheck__ in the wrong place
# in _ProtocolMeta.__instancheck__...
# in _ProtocolMeta.__instancecheck__...
self.assertIsInstance(Eggs(), Spam)

# ...and if it did, then TypeError wouldn't be raised here!
Expand All @@ -2683,7 +2683,7 @@ def __init__(self, x: T) -> None:

# gh-104555: ABCMeta might cache the result of this isinstance check
# if we called super().__instancecheck__ in the wrong place
# in _ProtocolMeta.__instancheck__...
# in _ProtocolMeta.__instancecheck__...
self.assertIsInstance(Eggs(42), Spam)

# ...and if it did, then TypeError wouldn't be raised here!
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