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

There could be many answers for this depending on the length of the list and the performance. One very simple way which I can think without thinking of the performance is this:

a = [1, 2, 3, 4]
a = [sum(a[0:x:1]) for x in range(len(a)+1)][1:]
print(a)

[1, 3, 6, 10]

This is by using list comprehension and this may work fairly well it is just that here I am adding over the subarray many times, you could possibly improvise on this and make it simple!

Cheers to your endeavor!