Running sum using accumulate in Python

Given a array in Python, we can use a for loop to make a running sum in place.
For example

arr = [1, 2, 3, 4, 5]
for i in range(1, len(arr)):
   arr[i] += arr[i - 1]

The arr now will contains all the running sum i.e. [1, 3, 6, 10, 15].

We can import the accumulate function from itertools:

arr = list(accumulate(arr))

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