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bpo-46244: Remove __slots__ from typing.TypeVar, .ParamSpec #30444

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Merged
merged 5 commits into from
Jan 10, 2022
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bpo-46244: Remove __slots__ from typing.TypeVar, .ParamSpec #30444

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f3362f4
add missing __slots__ to typing._TypeVarLike
ariebovenberg Jan 6, 2022
4cd5d2e
add news entry
ariebovenberg Jan 6, 2022
2c9f75e
remove slots from _TypeVarLike base classes
ariebovenberg Jan 10, 2022
e6f9966
cleanup diff
ariebovenberg Jan 10, 2022
34ec10c
fix broken link in blurb
ariebovenberg Jan 10, 2022
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6 changes: 0 additions & 6 deletions Lib/typing.py
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Original file line number Diff line number Diff line change
Expand Up @@ -805,9 +805,6 @@ def longest(x: A, y: A) -> A:
Note that only type variables defined in global scope can be pickled.
"""

__slots__ = ('__name__', '__bound__', '__constraints__',
'__covariant__', '__contravariant__', '__dict__')

def __init__(self, name, *constraints, bound=None,
covariant=False, contravariant=False):
self.__name__ = name
Expand Down Expand Up @@ -907,9 +904,6 @@ def add_two(x: float, y: float) -> float:
be pickled.
"""

__slots__ = ('__name__', '__bound__', '__covariant__', '__contravariant__',
'__dict__')

@property
def args(self):
return ParamSpecArgs(self)
Expand Down
2 changes: 2 additions & 0 deletions Misc/NEWS.d/next/Library/2022-01-06-21-31-14.bpo-46244.hjyfJj.rst
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@@ -0,0 +1,2 @@
Removed ``__slots__`` from :class:`typing.ParamSpec` and :class:`typing.TypeVar`.
They served no purpose. Patch by Arie Bovenberg.