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Python Program to Split a List Into Evenly Sized Chunks

In this example, you will learn to split a list into evenly sized chunks in different ways.

To understand this example, you should have the knowledge of the following Python programming topics:


Example 1: Using yield

def split(list_a, chunk_size):

    for i in range(0, len(list_a), chunk_size):
        yield list_a[i:i + chunk_size]

chunk_size = 2
my_list = [1,2,3,4,5,6,7,8,9]
print(list(split(my_list, chunk_size)))

Output

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

The above code splits the given array into smaller lists each of size 2. You can do the same thing using list compression as below.

chunk_size = 2
list_chunked = [my_list[i:i + chunk_size] for i in range(0, len(my_list), chunk_size)]
print(list_chunked)

Output

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

Example 2: Using numpy

import numpy as np

my_list = [1,2,3,4,5,6,7,8,9]
print(np.array_split(my_list, 5))

Output

[array([1, 2]), array([3, 4]), array([5, 6]), array([7, 8]), array([9])]

Note: You need to install numpy on your system.

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