Python program to find Cumulative sum of a list
The problem statement asks to produce a new list whose i^{th} element will be equal to the sum of the (i + 1) elements.
Examples :
Input : list = [10, 20, 30, 40, 50] Output : [10, 30, 60, 100, 150] Input : list = [4, 10, 15, 18, 20] Output : [4, 14, 29, 47, 67]
Approach 1 :
We will use the concept of list comprehension and list slicing to get the cumulative sum of the list. The list comprehension has been used to access each element from the list and slicing has been done to access the elements from start to the i+1 element. We have used the sum() method to sum up the elements of the list from start to i+1.
Below is the implementation of the above approach :
Python3
# Python code to get the Cumulative sum of a listdef Cumulative(lists): cu_list = [] length = len(lists) cu_list = [sum(lists[0:x:1]) for x in range(0, length+1)] return cu_list[1:]# Driver Codelists = [10, 20, 30, 40, 50]print (Cumulative(lists)) |
Output :
[10, 30, 60, 100, 150]
Approach 2:
Python3
list=[10,20,30,40,50]new_list=[]j=0for i in range(0,len(list)): j+=list[i] new_list.append(j) print(new_list)#code given by Divyanshu singh |
Output :
[10, 30, 60, 100, 150]
Attention geek! Strengthen your foundations with the Python Programming Foundation Course and learn the basics.
To begin with, your interview preparations Enhance your Data Structures concepts with the Python DS Course. And to begin with your Machine Learning Journey, join the Machine Learning – Basic Level Course
