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Python – Records Maxima in List of Tuples
  • Last Updated : 14 Jan, 2020

Sometimes, while working with records, we can have a problem in which we need to maximum 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 max() + 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 maximum using max().




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

 

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






# Python3 code to demonstrate working of
# Records Maxima in List of Tuples
# using zip() + map() + max()
  
# initialize list
test_list = [(1, 2, 3), (6, 7, 6), (1, 6, 8)]
  
# printing original list
print("The original list : " + str(test_list))
  
# Records Maxima in List of Tuples
# using zip() + map() + max()
res = list(map(max, zip(*test_list)))
  
# printing result
print("The Cummulative column maximum is : " + str(res))
Output :
The original list : [(1, 2, 3), (6, 7, 6), (1, 6, 8)]
The Cummulative column maximum is : [6, 7, 8]

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