Prefix sum array in Python using accumulate function

We are given an array, find prefix sums of given array.

Examples:

Input : arr = [1, 2, 3]
Output : sum = [1, 3, 6]

Input : arr = [4, 6, 12]
Output : sum = [4, 10, 22]

Recommended: Please try your approach on {IDE} first, before moving on to the solution.

A prefix sum is a sequence of partial sums of a given sequence. For example, the cumulative sums of the sequence {a, b, c, …} are a, a+b, a+b+c and so on. We can solve this problem in python quickly using accumulate(iterable) method.

# function to find cumulative sum of array 
from itertools import accumulate 
  
def cumulativeSum(input): 
      print ("Sum :", list(accumulate(input))) 
  
# Driver program 
if __name__ == "__main__": 
    input = [4, 6, 12] 
    cumulativeSum(input) 

Output:

Sum = [4, 10, 22]

My Personal Notes

Recommended Posts:

Shashank Mishra

Check out this Author's contributed articles.

If you like GeeksforGeeks and would like to contribute, you can also write an article using contribute.geeksforgeeks.org or mail your article to contribute@geeksforgeeks.org. See your article appearing on the GeeksforGeeks main page and help other Geeks.

Please Improve this article if you find anything incorrect by clicking on the "Improve Article" button below.