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bpo-42740: Fix get_args for PEP 585 collections.abc.Callable (GH-23963)

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PR 1/2. Needs backport to 3.9.
(cherry picked from commit 4140f10a16)

Co-authored-by: Ken Jin <28750310+Fidget-Spinner@users.noreply.github.com>
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Miss Islington (bot) 2020-12-28 12:26:39 -08:00 • committed by GitHub
parent 9f6a37cc07
commit 03e571f1d5
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2 changed files with 6 additions and 3 deletions
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5
Lib/test/test_typing.py
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@ -3071,6 +3071,11 @@ class C(Generic[T]): pass
self.assertEqual(get_args(Callable), ()) self.assertEqual(get_args(Callable), ())
self.assertEqual(get_args(list[int]), (int,)) self.assertEqual(get_args(list[int]), (int,))
self.assertEqual(get_args(list), ()) self.assertEqual(get_args(list), ())
self.assertEqual(get_args(collections.abc.Callable[[int], str]), ([int], str))
self.assertEqual(get_args(collections.abc.Callable[..., str]), (..., str))
self.assertEqual(get_args(collections.abc.Callable[[], str]), ([], str))
self.assertEqual(get_args(collections.abc.Callable[[int], str]),
get_args(Callable[[int], str]))
class CollectionsAbcTests(BaseTestCase): class CollectionsAbcTests(BaseTestCase):

4
Lib/typing.py
View file

@ -1507,13 +1507,11 @@ def get_args(tp):
""" """
if isinstance(tp, _AnnotatedAlias): if isinstance(tp, _AnnotatedAlias):
return (tp.__origin__,) + tp.__metadata__ return (tp.__origin__,) + tp.__metadata__
if isinstance(tp, _GenericAlias): if isinstance(tp, (_GenericAlias, GenericAlias)):
res = tp.__args__ res = tp.__args__
if tp.__origin__ is collections.abc.Callable and res[0] is not Ellipsis: if tp.__origin__ is collections.abc.Callable and res[0] is not Ellipsis:
res = (list(res[:-1]), res[-1]) res = (list(res[:-1]), res[-1])
return res return res
if isinstance(tp, GenericAlias):
return tp.__args__
return () return ()