gh-74690: typing: Simplify and optimise `_ProtocolMeta.__instancecheck__` by AlexWaygood · Pull Request #103159 · python/cpython · GitHub

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AlexWaygood:runtime-protocols-nominal-optimisation

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Performance of typing._ProtocolMeta._get_protocol_attrs and isinstance #74690

typing: Optimise nominal subtypes in _ProtocolMeta.__instancecheck__

awaiting core review

gh-102433: Use inspect.getattr_static in typing._ProtocolMeta.__instancecheck__ #103034

Merge branch 'main' into runtime-protocols-nominal-optimisation

Simplify and optimise

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cpython/Lib/typing.py

And the cls.__subclasshook__() call there means that we end up going through this method:

gh-74690: Document changes made to runtime-checkable protocols in 3.12 #103348

: typing: Simplify and optimise `_ProtocolMeta.__instan…

: typing: Simplify and optimise `_ProtocolMeta.__instan…

Backport performance improvements to runtime-checkable protocols python/typing_extensions#137

[Bug] typing_extensions.Protocol unsupported under typing_extensions ≥ 4.6.0 beartype/beartype#241

typing: one None-valued member makes isinstance() on a runtime_checkable Protocol O(N) per call #156413