[Python-Dev] Proposal: defaultdict (original) (raw)

Phillip J. Eby pje at telecommunity.com
Fri Feb 17 13:52:41 CET 2006

At 10:10 AM 02/17/2006 +0100, Georg Brandl wrote:

Guido van Rossum wrote:

> d = DefaultDict([]) > > can be written as simply > > d[key].append(value) > Feedback? Probably a good idea, has been proposed multiple times on clpy. One good thing would be to be able to specify either a default value or a factory function.

+1 on factory function, e.g. "DefaultDict(list)". A default value isn't very useful, because for immutable defaults, setdefault() works well enough. If what you want is a copy of some starting object, you can always do something like DefaultDict({1:2,3:4}.copy).

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