8000 gh-103171: Document and test behaviour change in 3.11 for runtime-checkable protocols decorated with `@final` by AlexWaygood · Pull Request #103173 · python/cpython · GitHub
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gh-103171: Document and test behaviour change in 3.11 for runtime-checkable protocols decorated with @final #103173

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gh-103171: Document and test behaviour change in 3.11 for runtime-checkable protocols decorated with @final #103173

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gh-103171: Document behaviour change in 3.11 for runtime-checkable pr…
AlexWaygood Apr 1, 2023
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Add a test, too
AlexWaygood Apr 1, 2023
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gh-103171: Document behaviour change in 3.11 for runtime-checkable pr… 
…otocols decorated with `@final`
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AlexWaygood committed Apr 1, 2023
commit 777f477e684b56e49b51922dd82f5187fec136bd
7 changes: 7 additions & 0 deletions Doc/library/typing.rst
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Expand Up @@ -1619,6 +1619,13 @@ These are not used in annotations. They are building blocks for creating generic

.. versionadded:: 3.8

.. versionchanged:: 3.11
Where a runtime-checkable protocol class ``X`` is decorated with
:func:`@typing.final <typing.final>`, an object ``y`` will now only be
considered an instance of ``X`` if the class of ``y`` is also decorated
with ``@final``. Runtime-checkable protocols decorated with ``@final``
can also no longer be used in :func:`issubclass` calls.

Other special directives
""""""""""""""""""""""""

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