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[3.9] gh-92106: Add test that subscription works on arbitrary TypedDicts (GH-92176) #92201

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Merged
merged 1 commit into from
May 3, 2022
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[3.9] gh-92106: Add test that subscription works on arbitrary TypedDicts (GH-92176) #92201

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13 changes: 13 additions & 0 deletions Lib/test/test_typing.py
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Original file line number Diff line number Diff line change
Expand Up @@ -4076,6 +4076,19 @@ def test_get_type_hints(self):
{'a': typing.Optional[int], 'b': int}
)

def test_non_generic_subscript(self):
# For backward compatibility, subscription works
# on arbitrary TypedDict types.
class TD(TypedDict):
a: T
A = TD[int]
self.assertEqual(A.__origin__, TD)
self.assertEqual(A.__parameters__, ())
self.assertEqual(A.__args__, (int,))
a = A(a = 1)
self.assertIs(type(a), dict)
self.assertEqual(a, {'a': 1})


class IOTests(BaseTestCase):

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