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Python | Cummulative Columns summation of Records
  • Last Updated : 03 Nov, 2019

Sometimes, while working with records, we can have a problem in which we need to sum all the columns of a container of lists which are tuples. This kind of application is common in web development domain. Let’s discuss certain ways in which this task can be performed.

Method #1 : Using sum() + list comprehension + zip()
This task can be performed using combination of above functions. In this, we cummulate the like index elements, i.e columns using zip(), and then iterate through them using list comprehension and perform summation using sum().




# Python3 code to demonstrate working of
# Cummulative Columns summation of Records
# using list comprehension + sum() + zip()
  
# initialize list
test_list = [(1, 2, 3), (6, 7, 6), (1, 6, 8)]
  
# printing original list
print("The original list : " + str(test_list))
  
# Cummulative Columns summation of Records
# using list comprehension + sum() + zip()
res =  [sum(ele) for ele in zip(*test_list)]
  
# printing result
print("The Cummulative column sum is : " + str(res))
Output :
The original list : [(1, 2, 3), (6, 7, 6), (1, 6, 8)]
The Cummulative column sum is : [8, 15, 17]

 

Method #2 : Using zip() + map() + sum()
This method is similar to the above method. In this, the task performed by list comprehension is performed by map(), which extends the summation of columns to zipped elements.






# Python3 code to demonstrate working of
# Cummulative Columns summation of Records
# using zip() + map() + sum()
  
# initialize list
test_list = [(1, 2, 3), (6, 7, 6), (1, 6, 8)]
  
# printing original list
print("The original list : " + str(test_list))
  
# Cummulative Columns summation of Records
# using zip() + map() + sum()
res = list(map(sum, zip(*test_list)))
  
# printing result
print("The Cummulative column sum is : " + str(res))
Output :
The original list : [(1, 2, 3), (6, 7, 6), (1, 6, 8)]
The Cummulative column sum is : [8, 15, 17]

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