17 Feb
2006
17 Feb
'06
4:44 p.m.
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>