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

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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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14 changes: 12 additions & 2 deletions Lib/test/test_typing.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2758,6 +2758,16 @@ def x(self): ...
with self.assertRaisesRegex(TypeError, only_classes_allowed):
issubclass(1, BadPG)

for proto in P, PG, BadP, BadPG:
with self.subTest(proto=proto.__name__):
self.assertIsSubclass(proto, Protocol)

# TODO: the behaviour of some of these is questionable!
# For now, just check that these don't raise any Exceptions
issubclass(object, Protocol)
issubclass(str, Protocol)
issubclass(C, Protocol)
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def test_protocols_issubclass_non_callable(self):
class C:
x = 1
Expand Down Expand Up @@ -3505,8 +3515,8 @@ def meth(self):
self.assertTrue(P._is_protocol)
self.assertTrue(PR._is_protocol)
self.assertTrue(PG._is_protocol)
self.assertFalse(P._is_runtime_protocol)
self.assertTrue(PR._is_runtime_protocol)
self.assertFalse(getattr(P, "_is_runtime_protocol", False))
self.assertTrue(getattr(PR, "_is_runtime_protocol", False))
self.assertTrue(PG[int]._is_protocol)
self.assertEqual(typing._get_protocol_attrs(P), {'meth'})
self.assertEqual(typing._get_protocol_attrs(PR), {'x'})
Expand Down
4 changes: 1 addition & 3 deletions Lib/typing.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1862,8 +1862,6 @@ def meth(self) -> T:
...
"""
__slots__ = ()
_is_protocol = True
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_is_runtime_protocol = False

def __init_subclass__(cls, *args, **kwargs):
super().__init_subclass__(*args, **kwargs)
Expand Down Expand Up @@ -1904,7 +1902,7 @@ def _proto_hook(other):

# ... otherwise check consistency of bases, and prohibit instantiation.
for base in cls.__bases__:
if not (base in (object, Generic) or
if not (base in {object, Generic, Protocol} 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