[Python-bugs-list] [ python-Bugs-580107 ] Subclassing WeakValueDictionary impossib

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Bugs item #580107, was opened at 2002-07-11 16:04
You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=105470&aid=580107&group_id=5470

Category: None
Group: None
Status: Open
Resolution: None
Priority: 5
Submitted By: Thomas Heller (theller)
Assigned to: Nobody/Anonymous (nobody)
Summary: Subclassing WeakValueDictionary impossib

Initial Comment:
I'm trying to subclass weakref.WeakValueDictionary, so 
that it can send notifications when keys are removed.

I subclassed it and implemented a new __delitem__ 
method, but unfortunately this is not called because 
WeakValueDictionary manipulates UserDict's data 
member directly (in __makeremove), without calling the 
__delitem__ method.

Inspection of the sources shows that this is also the 
case in other methods as well...

I finally overrided __makeremovemethod _and_ 
__delitem__ ;-(

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You can respond by visiting: 
https://sourceforge.net/tracker/?func=detail&atid=105470&aid=580107&group_id=5470