Python | Average of two lists

Last Updated : 19 Feb, 2020

The problem of finding a average values in a list is quite common. But sometimes this problem can be extended in two lists and hence becomes a modified problem. This article discusses shorthands by which this task can be performed easily. Let’s discuss certain ways in which this problem can be solved.

Method #1 : Using sum() + len() + “+” operator
The average value can be determined by the conventional sum() and len function of python and the extension of one to two lists can be dealt using the “+” operator.

# Python3 code to demonstrate
# Average of two lists
# using sum() + len() + "+" operator
  
# initializing lists
test_list1 = [1, 3, 4, 5, 2, 6]
test_list2 = [3, 4, 8, 3, 10, 1]
  
# printing the original lists
print ("The original list 1 is : " + str(test_list1))
print ("The original list 2 is : " + str(test_list2))
  
# Average of two lists
# using sum() + len() + "+" operator
res = sum(test_list1 + test_list2) / len(test_list1 + test_list2)
  
# printing result
print ("The Average of both lists is : " + str(res))

Output :

The original list 1 is : [1, 3, 4, 5, 2, 6]
The original list 2 is : [3, 4, 8, 3, 10, 1]
The Average of both lists is : 4.166666666666667

Method #2 : Using sum() + len() + chain()
Another method to perform this particular task is by using the chain function which performs the task similar to the “+” operator but using an iterator, hence faster.

# Python3 code to demonstrate
# Average of two lists
# using sum() + len() + "+" operator
from itertools import chain
  
# initializing lists
test_list1 = [1, 3, 4, 5, 2, 6]
test_list2 = [3, 4, 8, 3, 10, 1]
  
# printing the original lists
print ("The original list 1 is : " + str(test_list1))
print ("The original list 2 is : " + str(test_list2))
  
# Average of two lists
# using sum() + len() + "+" operator
res = sum(chain(test_list1, test_list2)) / len(list(chain(test_list1, test_list2)))
  
# printing result
print ("The Average of both lists is : " + str(res))

Output :

The original list 1 is : [1, 3, 4, 5, 2, 6]
The original list 2 is : [3, 4, 8, 3, 10, 1]
The Average of both lists is : 4.166666666666667

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