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