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> _______________________________________________ Python-Dev mailing list Python-Dev@python.org http://mail.python.org/mailman/listinfo/python-dev Unsubscribe: http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
