18: Get Sub List By Slicing a Python List - 1000+ Python Programs

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Question: Given a list of numbers, how would you use slicing to extract a sublist containing only the even numbers?

python_list = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]

In order to get a sublist by slicing of a Python List, you can use the slice notation which is a colon (:). It is used to separate the start and end indices of the sublist you want to extract.

Slicing Syntax:

list[start:end:step]

Finding the even numbers using slicing

python_list = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]

even_sublist = python_list[1::2] # step = 2

print(even_sublist)

Some more examples with List Slicing

Let us consider the same list of numbers from 1 to 10 and answer the below questions.

my_list = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]

1. Get a sublist from index 2 to index 6.

   print(my_list[2:6])

   [3,4,5,6]

2. Get a sublist from index 2 to index 6 with a step of 2.

   print(python_list[2:6:2])

   [3, 5]

3. Get a sublist from index 6 to the end of the list

   print(python_list[6:])

   [6,7,8,9,10]

4. Get a copy of the original list

   print(python_list[:])

   [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]