Find average of a list in python

Last Updated On Friday 10th Jun 2022

list mean

The Python Average function is used to find the average of given numbers in a list.

It can be done in many ways listed below,

  • Python Average by using the loop
  • By using sum() and len() built-in average function in Python
  • Using mean() from numpy library
  • Using mean() from the statistics module.

python average

Using For loop

  • The for loop will loop through the elements , and each number is added in the sum variable.
  • Then the average of list Python is calculated by using sum divided by the count of the numbers in the list using len() built-in function.
	def calculateAverage(num):
    sum = 0
    for each in num:
        sum = sum + each           
    avg = sum / len(num)
    return avg
	

Output

	print("The average is", calculateAverage([1, 2, 3, 4, 5, 6, 7, 8, 9, 10]))

# The average is 5.5
	

Using sum() and len()

  • Here, sum() and len() built-in functions are used to find average in Python.
  • It is also the way to calculate the average as you don’t have to loop through the elements.
	numList = [11, 12, 13, 14, 15, 16, 17, 18, 19, 20 ];

avg = sum(numList) / len(numList)

print("The average is ", avg)
	

Output

	The average is  15.5
	

Using mean() from numpy

  • mean() function that will give us the average for the list.
  • It is the library is commonly used library to work on large multi-dimensional arrays.
	from numpy import mean

numList = [21, 22, 23, 24, 25, 26, 27, 28, 29, 30 ];

avg = mean(numList)

print("The average is ", avg)
	

Output

	The average is  25.5
	

Using mean from statistics

  • Here , We will using the mean() function from the statistics module.
  • mean() function to calculate the average from the statistics module.
	from statistics import mean

numList = [31, 32, 33, 34, 35, 36, 37, 38, 39, 40 ];

avg = mean(numList)

print("The average is ", avg)
	

Output

	The average is  35.5
	
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