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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
merged 12 commits into from
May 17, 2023
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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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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
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AlexWaygood May 17, 2023
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📜🤖 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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📜🤖 Added by blurb_it.
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blurb-it[bot] authored May 17, 2023
commit 430cacd7795ea6603c16f759483e4fbaa44067d3
7 changes: 7 additions & 0 deletions Misc/NEWS.d/next/Library/2023-05-17-16-58-23.gh-issue-104555.5rb5oM.rst
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Fix issue where an :func:`issubclass` check comparing a class ``X`` against a
:func:`runtime-checkable protocol <typing.runtime_checkable>` ``Y`` with
non-callable members would not cause :exc:`TypeError` to be raised if an
:func:`isinstance` call had previously been made comparing an instance of ``X``
to ``Y``. This issue was present in edge cases on Python 3.11, but became more
prominent in 3.12 due to some unrelated changes that were made to
runtime-checkable protocols. Patch by Alex Waygood.