Skip to content
Related Articles

Related Articles

Python | Find sum of frequency of given elements in the list
  • Last Updated : 08 Apr, 2019

Given two lists containing integers, the task is to find sum of frequency of element of first list in second list.

Example:

Input: list1 = [1, 2, 3]
       list2 = [2, 1, 2, 1, 3, 5, 2, 3]

Output: 7

Explanation:
No of time 1 occurring in list2 is :2
No of time 2 occurring in list2 is :3
No of time 3 occurring in list2 is :2
Sum = 2+3+2 = 7

Below are some ways to achieve the above tasks.

Method #1: Using sum()




# Python code to find sum of frequency of 
# element of first list in second list.
  
# List initialization
Input1 = [1, 2, 3]
Input2 = [2, 1, 2, 1, 3, 5, 2, 3]
  
# Using sum
Output = sum(Input2.count(elem) for elem in Input1)
  
# Printing output
print("Initial list are:", Input1, Input2)
print("Frequency is:", Output)
Output:



Initial list are: [1, 2, 3] [2, 1, 2, 1, 3, 5, 2, 3]
Frequency is: 7

 
Method #2: Using sum() and Counter()




from collections import Counter
  
# List initialization
Input1 = [1, 2, 3]
Input2 = [2, 1, 2, 1, 3, 5, 2, 3]
  
  
temp = Counter(Input2)
Output = sum(temp[x] for x in Input1)
  
# Printing output
print("Initial list are:", Input1, Input2)
print("Frequency is:", Output)
Output:
Initial list are: [1, 2, 3] [2, 1, 2, 1, 3, 5, 2, 3]
Frequency is: 7

 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

My Personal Notes arrow_drop_up
Recommended Articles
Page :