Python – Every Kth index Maximum in List

We generally wish to employ a particular function to all the elements in a list. But sometimes, according to requirement we would wish to employ a particular functionality to certain elements of the list, basically to every Kth element in list. Let’s discuss certain ways in which maximum of these elements can be performed.

Method #1 : Using list comprehension + enumerate() + max()
The functionality of getting every Kth number of list can be done with the help of list comprehension and enumerate function helps in the iteration of the whole list. The max() helps to find max.

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# Python3 code to demonstrate
# Every Kth index Maximum in List
# using list comprehension + enumerate() + max()
  
# initializing list 
test_list = [1, 4, 5, 6, 7, 8, 9, 12]
  
# printing the original list
print ("The original list is : " + str(test_list))
  
# initializing K 
K = 3
  
# using list comprehension + enumerate() + max()
# Every Kth index Maximum in List
# max of every 3rd element
res = max([i for j, i in enumerate(test_list) if j % K == 0 ])
  
# printing result
print ("The max of every kth element : " + str(res))

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Output :

The original list is : [1, 4, 5, 6, 7, 8, 9, 12]
The max of every kth element : 9

 

Method #2 : Using list comprehension + list slicing
Above mentioned functions can help to perform these tasks. The list comprehension does the task of iteration in list and list slicing does the extraction of every Kth element.

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# Python3 code to demonstrate
# The max() helps to find max.
# using list comprehension + list slicing + max()
  
# initializing list 
test_list = [1, 4, 5, 6, 7, 8, 9, 12]
  
# printing the original list
print ("The original list is : " + str(test_list))
  
# using list comprehension + list slicing + max()
# Edit every Kth element in list 
# max of every 3rd element
res = max(test_list[0::3])
  
# printing result
print ("The max of every kth element : " + str(res))

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Output :

The original list is : [1, 4, 5, 6, 7, 8, 9, 12]
The max of every kth element : 9



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