[Python-Dev] Re: weakref gc semantics

[Tim Peters]

[Greg Ewing]
> Maybe the callback shouldn't be passed the weakref object?
> I don't see what good that does anyway, since the weakref
> is just an empty shell by then, isn't it?

If it's a builtin weakref object, yes.  Weakref subclasses can add
useful data, though.  The way Python's weak dictionaries exploit this
was explained earlier in the thread.