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bpo-45489: Update ForwardRef to support | operator. (GH-28991)

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Dong-hee Na 2021-10-17 00:12:58 +09:00 • committed by GitHub
parent 4ecd119b00
commit 15ad52fbf6
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3 changed files with 14 additions and 0 deletions
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6
Lib/test/test_typing.py
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@ -2903,6 +2903,12 @@ class ForwardRefTests(BaseTestCase):
self.assertNotEqual(gth(Loop, globals())['attr'], Final[int]) self.assertNotEqual(gth(Loop, globals())['attr'], Final[int])
self.assertNotEqual(gth(Loop, globals())['attr'], Final) self.assertNotEqual(gth(Loop, globals())['attr'], Final)
def test_or(self):
X = ForwardRef('X')
# __or__/__ror__ itself
self.assertEqual(X | "x", Union[X, "x"])
self.assertEqual("x" | X, Union["x", X])
class OverloadTests(BaseTestCase): class OverloadTests(BaseTestCase):

6
Lib/typing.py
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@ -719,6 +719,12 @@ class ForwardRef(_Final, _root=True):
def __hash__(self): def __hash__(self):
return hash(self.__forward_arg__) return hash(self.__forward_arg__)
def __or__(self, other):
return Union[self, other]
def __ror__(self, other):
return Union[other, self]
def __repr__(self): def __repr__(self):
return f'ForwardRef({self.__forward_arg__!r})' return f'ForwardRef({self.__forward_arg__!r})'

2
Misc/NEWS.d/next/Library/2021-10-16-23-46-39.bpo-45489.QB0rhG.rst Normal file
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@ -0,0 +1,2 @@
Update :class:`~typing.ForwardRef` to support ``|`` operator. Patch by
Dong-hee Na.