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Showing content from https://mail.python.org/pipermail/python-dev/2006-February/061416.html below:

[Python-Dev] Proposal: defaultdict

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[Terry Reedy]
> One is a 'universal dict' that maps every key to something -- the default if 
> nothing else.  That should not have the default ever explicitly entered. 
> Udict.keys() should only give the keys *not* mapped to the universal value.

Would you consider it a mapping invariant that "k in dd" implies "k in 
dd.keys()"?

Is the notion of __contains__ at odds with notion of universality?


Raymond 

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