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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 list
test_list = [6, 7, 3, 9, 10, 15]
  
# printing original list
print("The original list is : " + str(test_list))
  
# Harmonic Mean of List
# using loop + formula
sum = 0
for ele in test_list:
    sum += 1 / ele    
res = len(test_list)/sum
  
# printing result
print("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 list
test_list = [6, 7, 3, 9, 10, 15]
  
# printing original list
print("The original list is : " + str(test_list))
  
# Harmonic Mean of List
# using statistics.harmonic_mean()
res = statistics.harmonic_mean(test_list)
  
# printing result
print("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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