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| author | Nikita Sobolev <mail@sobolevn.me> | 2023-08-11 19:12:11 (GMT) |
|---|---|---|
| committer | GitHub <noreply@github.com> | 2023-08-11 19:12:11 (GMT) |
| commit | d93b4ac2ff7bce07fb1c8805f43838818598191c (patch) | |
| tree | ed96f4cf84526f069de3cdedc0cd07365a981836 /Lib/test/test_typing.py | |
| parent | 666b68e8f252e3c6238d6eed1fc82937a774316f (diff) | |
| download | cpython-d93b4ac2ff7bce07fb1c8805f43838818598191c.zip cpython-d93b4ac2ff7bce07fb1c8805f43838818598191c.tar.gz cpython-d93b4ac2ff7bce07fb1c8805f43838818598191c.tar.bz2 | |
gh-101162: Forbid using issubclass() with GenericAlias as the 1st arg (GH-103369)
Diffstat (limited to 'Lib/test/test_typing.py')
| -rw-r--r-- | Lib/test/test_typing.py | 16 |
1 files changed, 16 insertions, 0 deletions
diff --git a/Lib/test/test_typing.py b/Lib/test/test_typing.py index 0450a87..fa39c79 100644 --- a/Lib/test/test_typing.py +++ b/Lib/test/test_typing.py @@ -4091,6 +4091,22 @@ class GenericTests(BaseTestCase): with self.assertRaises(TypeError): C[()] + def test_generic_subclass_checks(self): + for typ in [list[int], List[int], + tuple[int, str], Tuple[int, str], + typing.Callable[..., None], + collections.abc.Callable[..., None]]: + with self.subTest(typ=typ): + self.assertRaises(TypeError, issubclass, typ, object) + self.assertRaises(TypeError, issubclass, typ, type) + self.assertRaises(TypeError, issubclass, typ, typ) + self.assertRaises(TypeError, issubclass, object, typ) + + # isinstance is fine: + self.assertTrue(isinstance(typ, object)) + # but, not when the right arg is also a generic: + self.assertRaises(TypeError, isinstance, typ, typ) + def test_init(self): T = TypeVar('T') S = TypeVar('S') |