Python: Cumulative sum of the elements of a given list

Last update on April 19 2025 13:00:48 (UTC/GMT +8 hours)

Cumulative Sum of List

Write a Python program to get the cumulative sum of the elements of a given list.

Sample Solution:

Python Code:

# Import the 'accumulate' function from the 'itertools' module.
from itertools import accumulate

# Define a function named 'cumsum' that computes the cumulative sum of a list.
def cumsum(lst):
    # Use the 'accumulate' function to calculate the cumulative sum and convert it to a list.
    return list(accumulate(lst))

# Create a sample list 'nums' with integer elements.
nums = [1, 2, 3, 4]
# Print the original list elements.
print("Original list elements:")
print(nums)
# Calculate and print the cumulative sum of the elements in the list using the 'cumsum' function.
print("Cumulative sum of the elements of the said list:")
print(cumsum(nums))

# Create another sample list 'nums' with integer elements, including negative values.
nums = [-1, -2, -3, 4]
# Print the original list elements.
print("\nOriginal list elements:")
print(nums)
# Calculate and print the cumulative sum of the elements in the list using the 'cumsum' function.
print("Cumulative sum of the elements of the said list:")
print(cumsum(nums))

Sample Output:

Original list elements:
[1, 2, 3, 4]
Cumulative sum of the elements of the said list:
[1, 3, 6, 10]

Original list elements:
[-1, -2, -3, 4]
Cumulative sum of the elements of the said list:
[-1, -3, -6, -2]

Flowchart:

For more Practice: Solve these Related Problems:

Write a Python program to compute the cumulative product of the elements in a list.
Write a Python program to calculate the cumulative sum and then return the differences between successive cumulative totals.
Write a Python program to find the maximum cumulative sum reached when iterating through a list of mixed numbers.
Write a Python program to compute the cumulative sum of a list recursively.

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