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bpo-39168: Remove the __new__ method of typing.Generic (GH-21327)

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Automerge-Triggered-By: @gvanrossum
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Zackery Spytz 2020-07-04 23:07:43 -06:00 • committed by GitHub
parent 9c84417122
commit 7fed75597f
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3 changed files with 1 additions and 12 deletions
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2
Lib/test/test_typing.py
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@ -1417,8 +1417,6 @@ class GenericTests(BaseTestCase):
def test_generic_errors(self): def test_generic_errors(self):
T = TypeVar('T') T = TypeVar('T')
S = TypeVar('S') S = TypeVar('S')
with self.assertRaises(TypeError):
Generic[T]()
with self.assertRaises(TypeError): with self.assertRaises(TypeError):
Generic[T][T] Generic[T][T]
with self.assertRaises(TypeError): with self.assertRaises(TypeError):

10
Lib/typing.py
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@ -894,16 +894,6 @@ class Generic:
__slots__ = () __slots__ = ()
_is_protocol = False _is_protocol = False
def __new__(cls, *args, **kwds):
if cls in (Generic, Protocol):
raise TypeError(f"Type {cls.__name__} cannot be instantiated; "
"it can be used only as a base class")
if super().__new__ is object.__new__ and cls.__init__ is not object.__init__:
obj = super().__new__(cls)
else:
obj = super().__new__(cls, *args, **kwds)
return obj
@_tp_cache @_tp_cache
def __class_getitem__(cls, params): def __class_getitem__(cls, params):
if not isinstance(params, tuple): if not isinstance(params, tuple):

1
Misc/NEWS.d/next/Library/2020-07-04-21-56-46.bpo-39168.DQWsXj.rst Normal file
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@ -0,0 +1 @@
Remove the ``__new__`` method of :class:`typing.Generic`.