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gh-92114: Improve error message for types with __class_getitem__ = None (GH-92115)

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Serhiy Storchaka 2022-05-02 08:29:49 +03:00 • committed by GitHub
parent ed711290a0
commit 4d10f703d7
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3 changed files with 12 additions and 1 deletions
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8
Lib/test/test_genericclass.py
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@ -220,6 +220,7 @@ class TestClassGetitem(unittest.TestCase):
return None
with self.assertRaises(TypeError):
C_too_few[int]
class C_too_many:
def __class_getitem__(cls, one, two):
return None
@ -232,16 +233,23 @@ class TestClassGetitem(unittest.TestCase):
return None
with self.assertRaises(TypeError):
C()[int]
class E: ...
e = E()
e.__class_getitem__ = lambda cls, item: 'This will not work'
with self.assertRaises(TypeError):
e[int]
class C_not_callable:
__class_getitem__ = "Surprise!"
with self.assertRaises(TypeError):
C_not_callable[int]
class C_is_none(tuple):
__class_getitem__ = None
with self.assertRaisesRegex(TypeError, "C_is_none"):
C_is_none[int]
def test_class_getitem_metaclass(self):
class Meta(type):
def __class_getitem__(cls, item):