2009/3/20 Emad Nawfal (عماد نوفل) <[email protected]>:
> if I want to do this with more than two dictionaries, the obvious solution
> for me is to use something like the reduce functions with a list of
> dictionary names like:
> dictList = [dict1, dict2, dict3]
> newDict = reduce(addDicts, dictList)
>
> Is this a satisfactory solution?
This will do some extra copying, as addDicts() always copies the first
argument. You would do better with something like
def addToDict(a, b):
for k,v in b.iteritems():
a[k] += v
return a
newDict = reduce(addDictTo, dictList[1:], defaultdict(int, dictList[0]))
or rewrite addDicts() to take a variable number of arguments and loop
over the args.
Kent
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