Average Function Python: How to Find Average of a List in Python

Python Average

To find the average of given numbers in a list, we use the Python Average function. Average in Python is usually calculated by adding all the numbers in a list and then dividing it by the number of elements in this list.

There are multiple ways to find the average of a List in Python, and two of the main ways are mentioned below:

1) Python Average: Len() and Sum()

2) Python Average: statistics.mean()

1) Python Average: Len() and Sum()

The Sum() and Len() functions are built-in in Python and are used to find the averages. 

This method of finding the average helps avoid looping through the list and hence is time and effort-saving. This also reduces redundancy and helps maintain DRY code since it helps in finding the average of a list using a single line.

Example 1

numbers = [30, 55, 3, 10, 2]

average = sum(numbers)/len(numbers)

print("Average of list: ", round(average,3))

Output

Average of the list:  20.0

Example 2

num_list = [1, 999, 2, 1023, 223, 876, 32]

average = sum(num_list)/len(num_list)

print("Average of list: ", round(average,2))

Output

Average of the list:  450.86

Example 3 

numbers = [3098, 5565, 323, 1120, 2342, 75664]

average = sum(numbers)/len(numbers)

print("Average of list: ", round(average,1))

Output

Average of the list:  14685.3

Example 4 

numbers = [3, 55986365, 564323, 1314320, 72325342, 7534265664]

average = sum(numbers)/len(numbers)

print("Average of list: ", round(average,4))

Output

Average of the list:  1277409336.1667

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2) Python Average: statistics.mean()

To easily calculate the python average of a list, we can use the statistics module’s mean() function. The following examples demonstrate the same.

Example 1 

from statistics import mean

num_list = [30, 55, 3, 10, 2]

average = mean(num_list)

print("Average: ", round(average,3))

Output

Average:  20

Example 2 

from statistics import mean

numbers = [1, 999, 2, 1023, 223, 876, 32]

average = mean(numbers)

print("Average: ", round(average,3))

Output

Average:  450.857

Example 3 

from statistics import mean

num_list = [3098, 5565, 323, 1120, 2342, 75664]

average = mean(num_list)

print("Average of list: ", round(average,1))

Output

Average of the list:  14685.3

Example 4 

from statistics import mean

num_list = [3, 55986365, 564323, 1314320, 72325342, 7534265664]

average = mean(num_list)

print("Average of list: ", round(average,4))

Output

Average of the list: 1277409336.1667

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