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bpo-39481: Implementation for PEP 585 (#18239)

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This implements things like `list[int]`,
which returns an object of type `types.GenericAlias`.
This object mostly acts as a proxy for `list`,
but has attributes `__origin__` and `__args__`
that allow recovering the parts (with values `list` and `(int,)`.

There is also an approximate notion of type variables;
e.g. `list[T]` has a `__parameters__` attribute equal to `(T,)`.
Type variables are objects of type `typing.TypeVar`.
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Guido van Rossum 2020-04-07 09:50:06 -07:00 • committed by GitHub
parent 9cc3ebd7e0
commit 48b069a003
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19
Lib/test/test_typing.py
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@ -1775,10 +1775,11 @@ class GenericTests(BaseTestCase):
self.assertEqual(T1[int, T].__origin__, T1)
self.assertEqual(T2.__parameters__, (T,))
with self.assertRaises(TypeError):
T1[int]
with self.assertRaises(TypeError):
T2[int, str]
# These don't work because of tuple.__class_item__
## with self.assertRaises(TypeError):
## T1[int]
## with self.assertRaises(TypeError):
## T2[int, str]
self.assertEqual(repr(C1[int]).split('.')[-1], 'C1[int]')
self.assertEqual(C2.__parameters__, ())
@ -1817,22 +1818,22 @@ class GenericTests(BaseTestCase):
self.clear_caches()
class MyTup(Tuple[T, T]): ...
self.assertIs(MyTup[int]().__class__, MyTup)
self.assertIs(MyTup[int]().__orig_class__, MyTup[int])
self.assertEqual(MyTup[int]().__orig_class__, MyTup[int])
class MyCall(Callable[..., T]):
def __call__(self): return None
self.assertIs(MyCall[T]().__class__, MyCall)
self.assertIs(MyCall[T]().__orig_class__, MyCall[T])
self.assertEqual(MyCall[T]().__orig_class__, MyCall[T])
class MyDict(typing.Dict[T, T]): ...
self.assertIs(MyDict[int]().__class__, MyDict)
self.assertIs(MyDict[int]().__orig_class__, MyDict[int])
self.assertEqual(MyDict[int]().__orig_class__, MyDict[int])
class MyDef(typing.DefaultDict[str, T]): ...
self.assertIs(MyDef[int]().__class__, MyDef)
self.assertIs(MyDef[int]().__orig_class__, MyDef[int])
self.assertEqual(MyDef[int]().__orig_class__, MyDef[int])
# ChainMap was added in 3.3
if sys.version_info >= (3, 3):
class MyChain(typing.ChainMap[str, T]): ...
self.assertIs(MyChain[int]().__class__, MyChain)
self.assertIs(MyChain[int]().__orig_class__, MyChain[int])
self.assertEqual(MyChain[int]().__orig_class__, MyChain[int])
def test_all_repr_eq_any(self):
objs = (getattr(typing, el) for el in typing.__all__)