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Python | Modulo K List

  • Last Updated : 19 Feb, 2020

While working with the python lists, we can come over a situation in which we require to modulo the integer k to each element in the list. We possibly need to iterate and modulo k to each element but that would increase the line of code. Let’s discuss certain shorthands to perform this task.

Method #1 : Using List Comprehension
List comprehension is just the short way to perform the task we perform using the naive method. This is mainly useful to save time and also is best among others when it comes to readability of the code.

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# Python3 code to demonstrate 
# Modulo K List
# using list comprehension
  
# initializing list 
test_list = [4, 5, 6, 3, 9]
  
# printing original list
print ("The original list is : " + str(test_list))
  
# initializing K
K = 4
  
# using list comprehension
# Modulo K List
res = [x % K for x in test_list]
  
# printing result 
print ("The list after Modulo K to each element : " + str(res))
Output :



The original list is : [4, 5, 6, 3, 9]
The list after Modulo K to each element : [0, 1, 2, 3, 1]

 

Method #2 : Using map() + lambda
The map function can be used to pair each element with the lambda function which performs the task of modulo K to each element in the list.




# Python3 code to demonstrate 
# Modulo K List
# using map() + lambda
  
# initializing list 
test_list = [4, 5, 6, 3, 9]
  
# printing original list
print ("The original list is : " + str(test_list))
  
# initializing K
K = 4
  
# using map() + lambda
# Modulo K List
res = list(map(lambda x : x % K, test_list))
  
# printing result 
print ("The list after Modulo K to each element : " + str(res))
Output :
The original list is : [4, 5, 6, 3, 9]
The list after Modulo K to each element : [0, 1, 2, 3, 1]



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