How to find the cumulative sum of numbers in a list?

Question

time_interval = [4, 6, 12]

I want to sum up the numbers like [4, 4+6, 4+6+12] in order to get the list t = [4, 10, 22].

Answer 1

Try this: accumulate function, along with operator add performs the running addition.

import itertools  
import operator  
result = itertools.accumulate([1,2,3,4,5], operator.add)  
list(result)