Get an accumulated sum of numbers in an iterable

accumulate yields a cumulative sum (or product) of numbers.

>>> import itertools as it
>>> import operator

>>> list(it.accumulate([1,2,3,4,5]))
[1, 3, 6, 10, 15]

>>> list(it.accumulate([1,2,3,4,5], func=operator.mul)) 
[1, 2, 6, 24, 120]

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