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Sun Oct 11 18:26:21 CEST 2009 · https://mail.python.org/pipermail/python-dev/2009-October/092948.html

Antoine Pitrou <solipsis <at> pitrou.net> writes:
> 
> 1. Add the safe methods listkeys(), listitems(), listvalues() which would 
> behave as the keys(), etc. methods from 2.x
> 
> 2. Make it so that keys(), items(), values() atomically build a list of 
> items internally, which makes them more costly for large weak dicts, but 
> robust.

And a third one (a bit more complicated implementation-wise):

3. Delay weak dict removals until any iteration has finished.

Regards

Antoine.

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[Python-Dev] Weak dict iterators are fragile