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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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