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[3.6] bpo-28556: Update to typing: treat subscripted generics as proxies (GH-265) (GH-268)

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(cherry picked from commit abb3b8ad94)
(cherry picked from commit 365cb5bb90)
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Mariatta 2017-02-24 16:40:50 -08:00 • committed by GitHub
parent f28db60179
commit bea9d2f648
2 changed files with 45 additions and 0 deletions
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35
Lib/test/test_typing.py
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@ -674,6 +674,41 @@ class GenericTests(BaseTestCase):
c.bar = 'abc'
self.assertEqual(c.__dict__, {'bar': 'abc'})
def test_subscripted_generics_as_proxies(self):
T = TypeVar('T')
class C(Generic[T]):
x = 'def'
self.assertEqual(C[int].x, 'def')
self.assertEqual(C[C[int]].x, 'def')
C[C[int]].x = 'changed'
self.assertEqual(C.x, 'changed')
self.assertEqual(C[str].x, 'changed')
C[List[str]].z = 'new'
self.assertEqual(C.z, 'new')
self.assertEqual(C[Tuple[int]].z, 'new')
self.assertEqual(C().x, 'changed')
self.assertEqual(C[Tuple[str]]().z, 'new')
class D(C[T]):
pass
self.assertEqual(D[int].x, 'changed')
self.assertEqual(D.z, 'new')
D.z = 'from derived z'
D[int].x = 'from derived x'
self.assertEqual(C.x, 'changed')
self.assertEqual(C[int].z, 'new')
self.assertEqual(D.x, 'from derived x')
self.assertEqual(D[str].z, 'from derived z')
def test_abc_registry_kept(self):
T = TypeVar('T')
class C(Generic[T]): ...
C.register(int)
self.assertIsInstance(1, C)
C[int]
self.assertIsInstance(1, C)
def test_false_subclasses(self):
class MyMapping(MutableMapping[str, str]): pass
self.assertNotIsInstance({}, MyMapping)