Guido van Rossum wrote: > A bunch of Googlers were discussing the best way of doing the > following (a common idiom when maintaining a dict of lists of values > relating to a key, sometimes called a multimap): > > if key not in d: d[key] = [] > d[key].append(value) /.../ > Feedback? +1. check it in, already (as collections.defaultdict, perhaps?) alternatively, you could specialize even further: collections.multimap, which deals with list values only (that shallow copy thing feels a bit questionable, but all alternatives feel slightly overgeneralized...) </F>
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