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Python | Column Average in Record List

  • Last Updated : 19 Feb, 2020

Sometimes the data that we receive, is in the form of tuples having data from various sources and we can usually have a use case in which we require to process the finding average of each index of tuple for cumulation. Let’s discuss certain ways in which this can be performed.

Method #1 : Using list comprehension
This is the most naive method to perform this particular task, in this method we compute the average of each index of all the possible indices of the tuple.




# Python3 code to demonstrate 
# Column Average in Record List
# using list comprehension
  
# initializing list 
test_list = [(1, 6), (3, 4), (5, 8)]
  
# printing original list 
print ("The original list is : " + str(test_list))
  
# Column Average in Record List
# using list comprehension
temp = sum(i[0] for i in test_list), sum(i[1] for i in test_list)
res = []
for ele in temp:
    res.append(ele / len(test_list))
  
# printing summation
print ("The position Average of tuples : " + str(res))
Output :
The original list is : [(1, 6), (3, 4), (5, 8)]
The position Average of tuples : [3.0, 6.0]

 

Method #2 : Using zip() + sum()
This is the most elegant and pythonic way to perform this particular task. In this we combine all the indices of the element using zip() and the performance of summation using sum function. And then divide the list by list length to compute average.






# Python3 code to demonstrate 
# Column Average in Record List
# using zip() + sum()
  
# initializing list 
test_list = [(1, 6), (3, 4), (5, 8)]
  
# printing original list 
print ("The original list is : " + str(test_list))
  
# Column Average in Record List
# using zip() + sum()
temp = [sum(i) for i in zip(*test_list)]
res = []
for ele in temp:
    res.append(ele / len(test_list))
  
# printing summation
print ("The position Average of tuples : " + str(res))
Output :
The original list is : [(1, 6), (3, 4), (5, 8)]
The position Average of tuples : [3.0, 6.0]

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