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Python | Position Summation in List of Tuples
  • Last Updated : 04 Feb, 2019

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 sum 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 summation of each index of all the possible indices of the tuple.




# Python3 code to demonstrate 
# position summation in list of tuples
# using list comprehension
  
# initializing list 
test_list = [(1, 6), (3, 4), (5, 8)]
  
# printing original list 
print ("The original list is : " + str(test_list))
  
# position Summation in List of Tuples
# using list comprehension
res = sum(i[0] for i in test_list), sum(i[1] for i in test_list)
  
# printing summation
print ("The position summation of tuples  : " + str(res))

Output :

The original list is : [(1, 6), (3, 4), (5, 8)]
The position summation of tuples  : (9, 18)

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.




# Python3 code to demonstrate 
# position summation in list of tuples
# using zip() + sum()
  
# initializing list 
test_list = [(1, 6), (3, 4), (5, 8)]
  
# printing original list 
print ("The original list is : " + str(test_list))
  
# position Summation in List of Tuples
# using zip() + sum()
res = [sum(i) for i in zip(*test_list)]
  
# printing summation
print ("The position summation of tuples  : " + str(res))

Output :

The original list is : [(1, 6), (3, 4), (5, 8)]
The position summation of tuples  : [9, 18]

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