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# Python | Separate odd and even index entries

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Method # 1: Using the Naive Method

Using the Naive method, this task can be accomplished using loops. You can use two containers one at a time to hold alternate elements and then join them together.

 ` # Python3 demo code ` ` # Separate odd and even index items ` ` # using a naive method `   ` # initializing list ` ` test_list ` ` = ` ` [` ` 3 ` `, ` ` 6 ` `, ` ` 7 ` `, ` ` 8 ` `, ` ` 9 ` `, ` ` 2 ` `, ` ` 1 , 5 ] ``   # print original list print ( "The original list:" + str (test_list))    # using the naive method # Separating odd and even index entries odd_i = [] even_i = [] for i in range ( 0 , len (test_list)): if i % 2 : even_i.append (test_list [i]) else : odd_i.append (test_list [i])   res = odd_i + even_i   # print result print ( " Seprated odd and even index list: " + str (res)) `

Output:

` The original list: [3, 6, 7, 8, 9, 2, 1, 5] Seprated odd and even index list: [3, 7, 9, 1 , 6, 8, 2, 5] `

Method # 2: Using List Slicing

This particular task can be easily accomplished using method of slicing lists in a more compact and efficient way, this is the recommended method for solving this problem.

 ` # Python3 demo code ` ` # Separate odd and even index items ` ` # Use list slicing `   ` # initializing list ` ` test_list ` ` = ` ` [` ` 3 ` `, ` ` 6 ` `, ` ` 7 ` `, ` ` 8 ` `, ` ` 9 ` `, ` ` 2 ` `, ` ` 1 ` `, ` ` 5 ` `] `   ` # print original list ` ` print ` ` (` ` "The original list:" ` ` + ` ` str ` ` (test_list)) `   ` # Using list slicing ` ` # Separating odd and even index entries ` ` res ` ` = ` ` test_list [:: ` ` 2 ` `] ` ` + ` ` test_list [` ` 1 ` ` :: ` ` 2 ` `] `   ` # print result ` ` print ` ` (` ` "Seprated odd and even index list:" ` ` + ` ` str ` ` (res)) `

Output:

` The original list: [3, 6, 7, 8, 9, 2, 1, 5] Seprated odd and even index list: [3, 7, 9, 1, 6, 8, 2, 5] `

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