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gh-105237: Allow calling issubclass(X, typing.Protocol) again #105239

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Merged
JelleZijlstra merged 6 commits into from
Jun 5, 2023
Merged

gh-105237: Allow calling issubclass(X, typing.Protocol) again #105239

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a6b11b0
Allow calling `issubclass(X, Protocol)`
AlexWaygood Jun 2, 2023
36b2ac9
Add back some implementation details so we don't unnecessarily break …
AlexWaygood Jun 2, 2023
db51c8d
Revert unnecessary changes to tests
AlexWaygood Jun 2, 2023
776bf2b
Fix longstanding bug and add many tests
AlexWaygood Jun 2, 2023
ffb7f1c
Small micro-optimisation
AlexWaygood Jun 2, 2023
b85a320
Cleaner solution
AlexWaygood Jun 2, 2023
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Cleaner solution
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@AlexWaygood
AlexWaygood committed Jun 2, 2023
commit b85a3205c4b22942c9cb4ce0f8619d7b04d2ffe0
6 changes: 4 additions & 2 deletions Lib/typing.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1805,6 +1805,8 @@ def __subclasscheck__(cls, other):
def __instancecheck__(cls, instance):
# We need this method for situations where attributes are
# assigned in __init__.
if cls is Protocol:
return type.__instancecheck__(cls, instance)
if not getattr(cls, "_is_protocol", False):
# i.e., it's a concrete subclass of a protocol
return super().__instancecheck__(instance)
Expand Down Expand Up @@ -1864,7 +1866,7 @@ def meth(self) -> T:
...
"""
__slots__ = ()
_is_protocol = False
_is_protocol = True
_is_runtime_protocol = False

def __init_subclass__(cls, *args, **kwargs):
Expand Down Expand Up @@ -1906,7 +1908,7 @@ def _proto_hook(other):

# ... otherwise check consistency of bases, and prohibit instantiation.
for base in cls.__bases__:
if not (base in {object, Generic, Protocol} or
if not (base in (object, Generic) or
base.__module__ in _PROTO_ALLOWLIST and
base.__name__ in _PROTO_ALLOWLIST[base.__module__] or
issubclass(base, Generic) and getattr(base, '_is_protocol', False)):
Expand Down