On Mon, Dec 14, 2009 at 9:49 PM, Brandon Devine <your.mas...@gmail.com> wrote:
> Hi all,
>
> I am probably not thinking straight anymore about this problem. I
> have a dictionary with tuple keys in the format (a, b, A, B) and float
> values. I want to collect all the keys with identical (a, b...),
> disregarding whatever (... A, B) might be. Specifically, I want to
> sum the float values once I've collected these keys. I am staring at
> my screen, pondering ugly things, and I just know I must be missing a
> Pythonic solution. Any suggestions?
from collections import defaultdict
new_dict = defaultdict(int)
for tupkey in your_dict:
new_key = tupkey[:2]
new_dict[new_key] += your_dict[tupkey]
Cheers,
Chris
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