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Title: gh-132604: Deprecate inherited runtime checkability of protocols by johnslavik · Pull Request #143806 · python/cpython · GitHub

Open Graph Title: gh-132604: Deprecate inherited runtime checkability of protocols by johnslavik · Pull Request #143806 · python/cpython

X Title: gh-132604: Deprecate inherited runtime checkability of protocols by johnslavik · Pull Request #143806 · python/cpython

Description: Issue: Non-runtime_checkable subclass of a runtime_checkable Protocol allows isinstance() #132604 I've chosen to go ahead with a 5-year deprecation period as Alex told me he'd do at least (thx!)....

Open Graph Description: Issue: Non-runtime_checkable subclass of a runtime_checkable Protocol allows isinstance() #132604 I've chosen to go ahead with a 5-year deprecation period as Alex told me he'd do at least...

X Description: Issue: Non-runtime_checkable subclass of a runtime_checkable Protocol allows isinstance() #132604 I've chosen to go ahead with a 5-year deprecation period as Alex told me he'd do ...

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Non-runtime_checkable subclass of a runtime_checkable Protocol allows isinstance() #132604https://github.com/python/cpython/issues/132604
soft deprecatehttps://github.com/python/cpython/issues/132941
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Deprecate inherited runtime checkability of protocolshttps://github.com/python/cpython/pull/143806/commits/521a6a5b341859ca8aa3dd5040803b520e4d2d25
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Add testshttps://github.com/python/cpython/pull/143806/commits/0adbbff803a89019d08d4f8c8d5e356284a6c170
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Document runtime-checkability on protocolshttps://github.com/python/cpython/pull/143806/commits/985e2670f261f6c8afabd604d82cc4c88c6428c7
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Add news entryhttps://github.com/python/cpython/pull/143806/commits/a583cce155caf3c754617f3021140fc3dcc4f6e4
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Jan 13, 2026 https://github.com/python/cpython/pull/143806#ref-issue-3000195457
Non-runtime_checkable subclass of a runtime_checkable Protocol allows isinstance() #132604 https://github.com/python/cpython/issues/132604
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January 13, 2026 16:47https://github.com/python/cpython/pull/143806#commits-pushed-5be278f
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Move RCProto3 below RCProto2https://github.com/python/cpython/pull/143806/commits/5be278f5be1c9f4492f47c9bb1b0fd11a2436f1c
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Simplify docstring of test class BaseProtohttps://github.com/python/cpython/pull/143806/commits/8886908e8b0b88d9589e5cede90a6c56403f6f87
8886908https://github.com/python/cpython/pull/143806/commits/8886908e8b0b88d9589e5cede90a6c56403f6f87
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Simplify non-RC proto refs in test class docstringshttps://github.com/python/cpython/pull/143806/commits/62dcdfe8188e13ea487969fbadf2b4c995186d4c
62dcdfehttps://github.com/python/cpython/pull/143806/commits/62dcdfe8188e13ea487969fbadf2b4c995186d4c
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Fix grammar errorhttps://github.com/python/cpython/pull/143806/commits/cef650417220b4328da290fcc255f9864ea56e40
cef6504https://github.com/python/cpython/pull/143806/commits/cef650417220b4328da290fcc255f9864ea56e40
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Add some methods to protocolshttps://github.com/python/cpython/pull/143806/commits/484381cb048e8c7234ec46c9a616cb58f4a81756
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Use arguments from subtests parametrization!https://github.com/python/cpython/pull/143806/commits/84d3af6ba88d2ad3e79e0fcbf552451717ae9ea9
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Merge branch 'main' into deprecate-inherited-runtime-protocolshttps://github.com/python/cpython/pull/143806/commits/ec78805bec2e4ff77dfcec4972d5efcaf3585fd5
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Fix semantic typo in testshttps://github.com/python/cpython/pull/143806/commits/4807a81a551c4cdd1ed81410ec19d36b7d8a31e8
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Add helpful comment about _is_deprecated_inherited_runtime_protocolhttps://github.com/python/cpython/pull/143806/commits/c2ff4764ac607aa5efba4ef008c6196c2c0058d6
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