Le Tue, 10 Sep 2013 22:00:37 +1000, Nick Coghlan <ncogh...@gmail.com> a écrit : > Is this just syntactic sugar for recursive lookup of a transformed > version in __missing__?
Nope. For one, it doesn't use __missing__ at all. I think using __missing__ would be... missing the point, because it wouldn't working properly if you have e.g. X != Y such that transform(X) == Y and transform(Y) == X. (a simple example being transform = str.swapcase :-)) > Or a way of supplying a custom "key" function > to a dictionary? Probably, although I'm not entirely sure what you mean by that :-) > Any such proposal should consider how it composes with other dict > variants like defaultdict, OrderedDict and counter. Well, one sticking point here is that those variants don't compose with each other already :-) But, yes, I may make another proposal with composition in mind. Regards Antoine. _______________________________________________ Python-Dev mailing list Python-Dev@python.org https://mail.python.org/mailman/listinfo/python-dev Unsubscribe: https://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
