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gh-112345: typing.Protocol
: Let failed subclasscheck show non-method members (#112344)
Co-authored-by: Alex Waygood <Alex.Waygood@Gmail.com>
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@ -4091,6 +4091,22 @@ def method(self) -> None: ...
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self.assertIsInstance(Foo(), ProtocolWithMixedMembers)
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self.assertNotIsInstance(42, ProtocolWithMixedMembers)
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def test_protocol_issubclass_error_message(self):
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class Vec2D(Protocol):
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x: float
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y: float
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def square_norm(self) -> float:
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return self.x ** 2 + self.y ** 2
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self.assertEqual(Vec2D.__protocol_attrs__, {'x', 'y', 'square_norm'})
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expected_error_message = (
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"Protocols with non-method members don't support issubclass()."
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" Non-method members: 'x', 'y'."
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)
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with self.assertRaisesRegex(TypeError, re.escape(expected_error_message)):
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issubclass(int, Vec2D)
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class GenericTests(BaseTestCase):
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@ -1828,8 +1828,13 @@ def __subclasscheck__(cls, other):
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not cls.__callable_proto_members_only__
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and cls.__dict__.get("__subclasshook__") is _proto_hook
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):
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non_method_attrs = sorted(
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attr for attr in cls.__protocol_attrs__
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if not callable(getattr(cls, attr, None))
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)
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raise TypeError(
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"Protocols with non-method members don't support issubclass()"
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"Protocols with non-method members don't support issubclass()."
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f" Non-method members: {str(non_method_attrs)[1:-1]}."
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)
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if not getattr(cls, '_is_runtime_protocol', False):
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raise TypeError(
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@ -0,0 +1,3 @@
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Improve error message when trying to call :func:`issubclass` against a
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:class:`typing.Protocol` that has non-method members.
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Patch by Randolf Scholz.
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