> Function name is perhaps not the best one. It occurs to me that this
> is the GROUP BY in SQL so perhaps a different name is better, but
> then again this might be moot if such a already exists somewhere :)
Amazing, you keep reinventing things, even with the exact same name :)
from itertools import imap,groupby
from operator import itemgetter
for fruit,group in groupby(fruits, itemgetter(0)):
print fruit, "has a sum of", sum(imap(itemgetter(1),group))
For this to work as intended, fruits has to be already sorted by the
same key given to grouby; otherwise just replace fruits with
sorted(fruits, itemgetter(0)).
By the way, read all the functions in the itertools module
(http://docs.python.org/lib/itertools-functions.html), it will save you
a lot of time.
George
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