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Python | Maximize Record list

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  • Last Updated : 31 Dec, 2019
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Sometimes, while working with Python records, we can have a problem in which we need to perform cross maximization of list of tuples. This kind of application is popular in web development domain. Let’s discuss certain ways in which this task can be performed.

Method #1 : Using list comprehension + zip()
The combination of above functionalities can be used to perform this particular task. In this, we iterate through the list using list comprehension and the maximization across lists is performed with help of zip().




# Python3 code to demonstrate working of
# Maximize Record list
# using list comprehension + zip()
  
# initialize lists
test_list1 = [(2, 4), (6, 7), (5, 1)]
test_list2 = [(5, 4), (8, 10), (8, 14)]
  
# printing original lists
print("The original list 1 : " + str(test_list1))
print("The original list 2 : " + str(test_list2))
  
# Maximize Record list
# using list comprehension + zip()
res = [(max(x[0], y[0]), max(x[1], y[1])) for x, y in zip(test_list1, test_list2)]
  
# printing result
print("The Maximums across lists is : " + str(res))

Output :

The original list 1 : [(2, 4), (6, 7), (5, 1)]
The original list 2 : [(5, 4), (8, 10), (8, 14)]
The Maximums across lists is : [(5, 4), (8, 10), (8, 14)]

 

Method #2 : Using max() + zip() + map()
This is yet another way to perform this task. This is similar to above method, the difference is that maximization is performed by inbuilt function and extending logic to each element is done by map().




# Python3 code to demonstrate working of
# Maximize Record list
# using max() + zip() + map()
  
# initialize lists
test_list1 = [(2, 4), (6, 7), (5, 1)]
test_list2 = [(5, 4), (8, 10), (8, 14)]
  
# printing original lists
print("The original list 1 : " + str(test_list1))
print("The original list 2 : " + str(test_list2))
  
# Maximize Record list
# using max() + zip() + map()
res = [tuple(map(max, zip(a, b))) for a, b in zip(test_list1, test_list2)]
  
# printing result
print("The maximums across lists is : " + str(res))

Output :

The original list 1 : [(2, 4), (6, 7), (5, 1)]
The original list 2 : [(5, 4), (8, 10), (8, 14)]
The Maximums across lists is : [(5, 4), (8, 10), (8, 14)]

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