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# Python | Divide K elements after every N values

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Method # 1: Using Loops
This is a naive and brute force method, to solve this particular problem with a loop, we can generate a new list to check for K occurrences of elements after each N elements.

 ` # Python3 code for demonstration ` ` # Getting K elements after N values ​​` ` # using loops `   ` # initializing list ` ` test_list ` ` = ` ` [` ` 4 ` `, ` ` 5 ` `, ` ` 2 ` `, ` ` 7 ` `, ` ` 8 ` `, ` ` 4 ` `, ` ` 10 ` `, ` ` 9 ` `, ` ` 11 ` `, ` ` 13 ` `] `   ` # print original list ` ` print ` ` (` ` "The original list:" ` ` + ` ` str ` ` (test_list)) `   ` # initializing N and K ` ` N ` ` = ` ` 2 ` ` K ` ` = ` ` 3 ` ` `  ` # using loops ` ` # Getting K elements after N values ​​` ` res ` ` = ` ` [] ` ` while ` ` test_list: ` ` res ` ` + ` ` = ` ` test_list [: K] ` ` test_list ` ` = ` ` test_list [K ` ` + ` ` N:] `   ` # print result ` ` print ` ` (` ` "The list after selective slicing:" ` ` + ` ` str ` ` (res)) `

Output:

` The original list: [4, 5, 2, 7, 8, 4, 10, 9, 11, 13] The list after selective slicing: [4 , 5, 2, 4, 10, 9] `

Method # 2: Using List Comprehension
This particular task can be accomplished using a shorthand method the above method using list comprehension, in this method we also use list slicing to perform the slicing required.

 ` # Python3 demo code ` ` # Get K elements after N values ​​` ` # use comprehension list `   ` # initializing list ` ` test_list ` = ` [` ` 4 ` `, ` ` 5 ` `, ` ` 2 ` `, ` ` 7 ` `, ` ` 8 ` ` , ` ` 4 ` `, ` ` 10 ` `, ` ` 9 ` `, ` ` 11 ` `, ` ` 13 ` `] ` ` `  ` # print original list ` ` print ` ` (` `" The original list: "` ` + ` ` str ` ` (test_list)) ` ` `  ` # initializing N and K ` ` N ` ` = ` ` 2 ` ` K ` ` = ` ` 3 ` ` `  ` # using comprehension list ` ` # Getting K elements after N values ​​` ` res ` ` = ` ` [y ` ` for ` ` x ` ` in ` ` [test_list [i: i ` ` + ` ` K] ` ` for ` ` i ` ` in `  ` range ` ` (` ` 0 ` `, ` ` len ` ` (test_list), N ` ` + ` ` K)] ` ` for ` ` y ` ` in ` ` x] `   ` # print result ` ` print ` ` (` ` " The list after selective slicing: "` ` + ` ` str ` ` (res)) `

Output:

` The original list: [4, 5, 2, 7, 8, 4, 10, 9, 11, 13] The list after selective slicing: [4, 5, 2, 4, 10, 9] `

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