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bpo-44793: Fix checking the number of arguments when subscribe a generic type with ParamSpec parameter. (GH-27515)

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For example Callable[P, T][[int], str, float] will now raise an error.

Use also term "arguments" instead of "parameters" in error
message for too few/many arguments.
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Serhiy Storchaka 2021-08-02 09:17:46 +03:00 • committed by GitHub
parent 208a7e957b
commit f92b9133ef
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3 changed files with 15 additions and 8 deletions
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6
Lib/test/test_typing.py
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@ -626,8 +626,6 @@ class TypingCallableTests(BaseCallableTests, BaseTestCase):
self.assertEqual(c1.__args__, c2.__args__)
self.assertEqual(hash(c1.__args__), hash(c2.__args__))
test_errors = skip("known bug #44793")(BaseCallableTests.test_errors)
class CollectionsCallableTests(BaseCallableTests, BaseTestCase):
Callable = collections.abc.Callable
@ -4588,6 +4586,10 @@ class ParamSpecTests(BaseTestCase):
G1 = X[int, P_2]
self.assertEqual(G1.__args__, (int, P_2))
self.assertEqual(G1.__parameters__, (P_2,))
with self.assertRaisesRegex(TypeError, "few arguments for"):
X[int]
with self.assertRaisesRegex(TypeError, "many arguments for"):
X[int, P_2, str]
G2 = X[int, Concatenate[int, P_2]]
self.assertEqual(G2.__args__, (int, Concatenate[int, P_2]))