Python | Harmonic Mean of List

• Last Updated : 14 Jan, 2020

While working with Python, we can have a problem in which we need to find harmonic mean of a list cumulative. This problem is common in Data Science domain. Let’s discuss certain ways in which this problem can be solved.

Method #1 : Using loop + formula
The simpler manner to approach this problem is to employ the formula for finding harmonic mean and perform using loop shorthands. This is the most basic approach to solve this problem.

 # Python3 code to demonstrate working of# Harmonic Mean of List# using loop + formula  # initialize listtest_list = [6, 7, 3, 9, 10, 15]  # printing original listprint("The original list is : " + str(test_list))  # Harmonic Mean of List# using loop + formulasum = 0for ele in test_list:    sum += 1 / ele    res = len(test_list)/sum  # printing resultprint("The harmonic mean of list is : " + str(res))
Output :
The original list is : [6, 7, 3, 9, 10, 15]
The harmonic mean of list is : 6.517241379310345

Method #2 : Using statistics.harmonic_mean()
This task can also be performed using inbuilt function of harmonic_mean(). This is new in Python versions >= 3.8.

 # Python3 code to demonstrate working of# Harmonic Mean of List# using statistics.harmonic_mean()import statistics   # initialize listtest_list = [6, 7, 3, 9, 10, 15]  # printing original listprint("The original list is : " + str(test_list))  # Harmonic Mean of List# using statistics.harmonic_mean()res = statistics.harmonic_mean(test_list)  # printing resultprint("The harmomin mean of list is : " + str(res))
Output :
The original list is : [6, 7, 3, 9, 10, 15]
The harmonic mean of list is : 6.517241379310345

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