module.
weakattrs are weakly-referenced attributes. when the value they reference is no
longer strongly-referenced by something else, the weakattrs "nullify" themselves.
weakmethod is a method decorator, like classmethod et al, that returns "weakly
bound" methods. weakmethod's im_self is a weakref.proxy to `self`, which means
the mere method will not keep the entire instance alive. instead, you'll get a
ReferenceError.
i think these two features are quite useful, and being part of the stdlib, would
provide programmers with easy-to-use solutions to object-aliveness issues.
more info, examples, and suggested implementation:
* http://sebulba.wikispaces.com/recipe+weakattr
* http://sebulba.wikispaces.com/recipe+weakmethod
-tomer
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