Get every other element in a List in Python

This tutorial will discuss about unique ways to get every other element in a list in Python.

Table Of Contents

Method 1: Using Slicing

We can use the slicing to select every 2nd element from list i.e. every other element from list.

listOfNumbers[1 : : 2]

It will return a sublist containing every another element from the list. Basically it selects every 2nd element from list i.e. from index position 1 till the end of list, and with a step size 2.

Let’s see the complete example,

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listOfNumbers = [11, 22, 33, 44, 55, 66, 77, 88, 99, 109]

# Get every other element from List

subList = listOfNumbers[1 : : 2]

print (subList)

Output

[22, 44, 66, 88, 109]

Method 2: Using itertools

The itertools module in Python, provides a function islice(), to get some specific elements from list based on slicing. So, to select every 2nd element from list i.e. every other element, pass the following arguments in islice()

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list(itertools.islice(listOfNumbers, 1, None, 2))

It will return a sublist containing every 2nd element from the list. Basically, the islice() method returns an iterator pointing to every 2nd element from list, because we started the slicing from index position 1 till the end of list, and with a step size 2. In the end, we passed that iterator to the list() method, to get a list containing every other element of main list.

Let’s see the complete example,

import itertools

listOfNumbers = [11, 22, 33, 44, 55, 66, 77, 88, 99, 109]

# Get every other element from List
subList = list(itertools.islice(listOfNumbers, 1, None, 2))

print(subList)

Output

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[22, 44, 66, 88, 109]

Summary

We learned about different ways to get every other element from a List in Python. Thanks.

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