Question

How to implement a cumulative sum of numbers in an int list in Python

Answer 1

def cumulative_sum_of_int_list(lst):
    sum_lst = [0] * len(lst)
    
    total_sum = 0
    for i in range(len(lst)):
        total_sum += lst[i]
        sum_lst[i] = total_sum
    
    return sum_lst


# 0 : 0+1=1 : 0+1+2=3 : 0+1+2+3=6 : 0+1+2+3+4=10 : 0+1+2+3+4+5=15 ...
lst = [0, 1, 2, 3, 4, 5, 6]

sum_arr = cumulative_sum_of_int_list(lst)
    
for i in range(len(sum_arr)):
    print(sum_arr[i], end=" ")



'''
run:

0 1 3 6 10 15 21 

'''

 

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Answer 2

import numpy as np

# 0 : 0+1=1 : 0+1+2=3 : 0+1+2+3=6 : 0+1+2+3+4=10 : 0+1+2+3+4+5=15 ...
lst = [0, 1, 2, 3, 4, 5, 6]

lst = np.cumsum(lst)

print(lst)


'''
run:

[ 0  1  3  6 10 15 21]

'''

 

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