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bpo-41559: Change PEP 612 implementation to pure Python (#25449)

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Ken Jin 2021-04-28 23:38:14 +08:00 • committed by GitHub
parent c1a9535989
commit 859577c249
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4 changed files with 92 additions and 71 deletions
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17
Lib/test/test_genericalias.py
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@ -353,6 +353,12 @@ class BaseTest(unittest.TestCase):
self.assertEqual(repr(C4[dict]).split(".")[-1], "Callable[[int, dict], str]")
self.assertEqual(C4[dict], Callable[[int, dict], str])
# substitute a nested GenericAlias (both typing and the builtin
# version)
C5 = Callable[[typing.List[T], tuple[K, T], V], int]
self.assertEqual(C5[int, str, float],
Callable[[typing.List[int], tuple[str, int], float], int])
with self.subTest("Testing type erasure"):
class C1(Callable):
def __call__(self):
@ -391,5 +397,16 @@ class BaseTest(unittest.TestCase):
self.assertEqual(repr(C1), "collections.abc.Callable"
"[typing.Concatenate[int, ~P], int]")
with self.subTest("Testing TypeErrors"):
with self.assertRaisesRegex(TypeError, "variables left in"):
alias[int]
P = typing.ParamSpec('P')
C1 = Callable[P, T]
with self.assertRaisesRegex(TypeError, "many arguments for"):
C1[int, str, str]
with self.assertRaisesRegex(TypeError, "few arguments for"):
C1[int]
if __name__ == "__main__":
unittest.main()