On Thu, Jun 12, 2008 at 3:48 PM, Mark <[EMAIL PROTECTED]> wrote:
> Hi all,
>
> I have a scenario where I have a list like this:
>
> User Score
> 1 0
> 1 1
> 1 5
> 2 3
> 2 1
> 3 2
> 4 3
> 4 3
> 4 2
>
> And I need to add up the score for each user to get something like
> this:
>
> User Score
> 1 6
> 2 4
> 3 2
> 4 8
>
> Is this possible? If so, how can I do it? I've tried looping through
> the arrays and not had much luck so far.
Here is another solution:
from itertools import groupby
from operator import itemgetter
users = [1, 1, 1, 2, 2, 3, 4, 4, 4]
scores = [0, 1, 5, 3, 1, 2, 3, 3, 2]
for u, s in groupby(zip(users, scores), itemgetter(0)):
print u, sum(y for x, y in s)
You probably should reconsider how you can store your data in a more
efficient format.
--
mvh Björn
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