[Python-Dev] WeakSet in Python 2.7

[Michael Foord]

Hello all,

Python 3 includes a WeakSet implementation. Any objections to me 
backporting this to 2.7?

http://docs.python.org/py3k/library/weakref.html#weakref.WeakSet

I needed this in unittest and used a WeakKeyDictionary instead.

Michael

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