Accumulate function in python

[Peter Otten]

dhruvbird wrote:

>   I have a list of integers: x = [ 0, 1, 2, 1, 1, 0, 0, 2, 3 ]
>   And would like to compute the cumulative sum of all the integers
> from index zero into another array. So for the array above, I should
> get: [ 0, 1, 3, 4, 5, 5, 5, 7, 10 ]
>   What is the best way (or pythonic way) to get this.

Homework?

>>> def cumulative_sum(values, start=0):
...     for v in values:
...             start += v
...             yield start
...
>>> list(cumulative_sum([ 0, 1, 2, 1, 1, 0, 0, 2, 3 ]))
[0, 1, 3, 4, 5, 5, 5, 7, 10]

Peter