[me] > > - Weak references. This *is* a PEP, but there's no contents yet. We > > could also try to implement (just) weak dictionaries. [MAL] > These already exist... http://www.handshake.de/~dieter/weakdict.html > > mx.Proxy also has an implementation which support weak references. Thanks. For Fred to read... > BTW, are these still needed now that we have GC ? Yes, definitely. Weak dicts are sometimes needed for situations where a regular dict would keep objects alive forever. E.g. we were made aware of a "leak" in JPython that could only be fixed with weak dicts: the Swing wrapper code has a global dict mapping widgets to callback functions, and this keeps all widgets alive forever. The Java GC doesn't destroy the widgets, because they are still referenced from the dict. A weak dict solves this problem nicely (if it weren't that JDK 1.1 doesn't support weak dicts). --Guido van Rossum (home page: http://www.python.org/~guido/)
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