8000 gh-105144: Runtime-checkable protocols: move all 'sanity checks' to `_ProtocolMeta.__subclasscheck__` by AlexWaygood · Pull Request #105152 · python/cpython · GitHub
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gh-105144: Runtime-checkable protocols: move all 'sanity checks' to _ProtocolMeta.__subclasscheck__ #105152

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Merged
merged 4 commits into from
May 31, 2023
Merged

gh-105144: Runtime-checkable protocols: move all 'sanity checks' to _ProtocolMeta.__subclasscheck__ #105152

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Runtime-checkable protocols: move all 'sanity checks' to `_ProtocolMe…
AlexWaygood May 31, 2023
3b56274
Simplify
AlexWaygood May 31, 2023
0b13ae0
Explicitly clear the cache
AlexWaygood May 31, 2023
3ba9647
off-by-one error in a comment!
AlexWaygood May 31, 2023
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Simplify
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@AlexWaygood
AlexWaygood committed May 31, 2023
commit 3b56274c3d6a846ceaf02145ab89f44190cd6e3b
6 changes: 3 additions & 3 deletions Lib/typing.py
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Expand Up @@ -1727,7 +1727,7 @@ def _caller(depth=1, default='__main__'):
pass
return None

def _allow_reckless_class_checks(depth=3):
def _allow_reckless_class_checks(depth=2):
"""Allow instance and class checks for special stdlib modules.

The abc and functools modules indiscriminately call isinstance() and
Expand Down Expand Up @@ -1787,7 +1787,7 @@ def __subclasscheck__(cls, other):
raise TypeError('issubclass() arg 1 must be a class')
if (
getattr(cls, '_is_protocol', False)
and not _allow_reckless_class_checks(depth=2)
and not _allow_reckless_class_checks()
):
if not cls.__callable_proto_members_only__:
raise TypeError(
Expand All @@ -1809,7 +1809,7 @@ def __instancecheck__(cls, instance):

if (
not getattr(cls, '_is_runtime_protocol', False) and
not _allow_reckless_class_checks(depth=2)
not _allow_reckless_class_checks()
):
raise TypeError("Instance and class checks can only be used with"
" @runtime_checkable protocols")
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