[Python-Dev] Proposal: defaultdict
raymond.hettinger at verizon.net
Sun Feb 19 08:11:33 CET 2006
> 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
Is the notion of __contains__ at odds with notion of universality?
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