Nov 24, 2023 · Nov 23, 2023 · Nov 23, 2023 · Nov 23, 2023 · Nov 23, 2023 · Nov 23, 2023
diff --git a/Lib/test/test_typing.py b/Lib/test/test_typing.py
        self.assertIsInstance(Foo(), ProtocolWithMixedMembers)
        self.assertNotIsInstance(42, ProtocolWithMixedMembers)

    def test_protocol_issubclass_error_message(self):
        class Vec2D(Protocol):
            x: float
            y: float

            def square_norm(self) -> float:
                return self.x ** 2 + self.y ** 2

        assert Vec2D.__protocol_attrs__ == {'x', 'y', 'square_norm'}
        expected_error_message = (
            "Protocols with non-method members don't support issubclass()."
            " Non-method members: {'x', 'y'}."
        )

        try:
            issubclass(int, Vec2D)
        except TypeError as exc:
            self.assertEqual(str(exc), expected_error_message)


 class GenericTests(BaseTestCase):
Original file line number	Diff line number	Diff line change
Expand Up		@@ -4091,6 +4091,25 @@ def method(self) -> None: ...
		self.assertIsInstance(Foo(), ProtocolWithMixedMembers)
		self.assertNotIsInstance(42, ProtocolWithMixedMembers)

		def test_protocol_issubclass_error_message(self):
		class Vec2D(Protocol):
		x: float
		y: float

		def square_norm(self) -> float:
		return self.x 2 + self.y 2

		assert Vec2D.__protocol_attrs__ == {'x', 'y', 'square_norm'}
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		expected_error_message = (
		"Protocols with non-method members don't support issubclass()."
		" Non-method members: {'x', 'y'}."
		)

		try:
		issubclass(int, Vec2D)
		except TypeError as exc:
		self.assertEqual(str(exc), expected_error_message)
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		class GenericTests(BaseTestCase):

Expand Down