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bpo-38761: Register WeakSet as a MutableSet (GH-17104)

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Raymond Hettinger 2019-11-10 20:12:04 -08:00 • committed by GitHub
parent af46450bb9
commit 84ac437658
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5
Lib/test/test_weakset.py
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@ -2,6 +2,7 @@ import unittest
from weakref import WeakSet from weakref import WeakSet
import string import string
from collections import UserString as ustr from collections import UserString as ustr
from collections.abc import Set, MutableSet
import gc import gc
import contextlib import contextlib
@ -437,6 +438,10 @@ class TestWeakSet(unittest.TestCase):
def test_repr(self): def test_repr(self):
assert repr(self.s) == repr(self.s.data) assert repr(self.s) == repr(self.s.data)
def test_abc(self):
self.assertIsInstance(self.s, Set)
self.assertIsInstance(self.s, MutableSet)
if __name__ == "__main__": if __name__ == "__main__":
unittest.main() unittest.main()

3
Lib/weakref.py
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@ -33,6 +33,9 @@ __all__ = ["ref", "proxy", "getweakrefcount", "getweakrefs",
"WeakSet", "WeakMethod", "finalize"] "WeakSet", "WeakMethod", "finalize"]
_collections_abc.Set.register(WeakSet)
_collections_abc.MutableSet.register(WeakSet)
class WeakMethod(ref): class WeakMethod(ref):
""" """
A custom `weakref.ref` subclass which simulates a weak reference to A custom `weakref.ref` subclass which simulates a weak reference to

1
Misc/NEWS.d/next/Library/2019-11-10-13-40-33.bpo-38761.P1UUIZ.rst Normal file
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@ -0,0 +1 @@
WeakSet is now registered as a collections.abc.MutableSet.