How to Efficiently Divide a List into Balanced Chunks in Python?

How to Divide a List into Balanced Portions

Dividing a list into equally-sized chunks is essential in various programming scenarios. Python provides several methods to accomplish this task, offering flexibility and efficiency. One popular approach utilizes a generator function.

The chunks() generator, introduced in the answer, allows you to partition a list into chunks of a specified size. It iterates over the list in steps of the defined chunk size, yielding consecutive chunks. The following code demonstrates how to use the chunks() generator:

def chunks(lst, n):
    """Yield successive n-sized chunks from lst."""
    for i in range(0, len(lst), n):
        yield lst[i:i + n]

To exemplify its functionality, consider splitting a list of integers into chunks of size 10:

import pprint
pprint.pprint(list(chunks(range(10, 75), 10)))

This code produces the following output, showcasing the list divided into evenly-sized chunks:

[[10, 11, 12, 13, 14, 15, 16, 17, 18, 19],
 [20, 21, 22, 23, 24, 25, 26, 27, 28, 29],
 [30, 31, 32, 33, 34, 35, 36, 37, 38, 39],
 [40, 41, 42, 43, 44, 45, 46, 47, 48, 49],
 [50, 51, 52, 53, 54, 55, 56, 57, 58, 59],
 [60, 61, 62, 63, 64, 65, 66, 67, 68, 69],
 [70, 71, 72, 73, 74]]

While the generator approach is recommended for its clarity and efficiency, Python also offers a concise list comprehension solution for list chunking:

[lst[i:i + n] for i in range(0, len(lst), n)]

Remember that using named functions like chunks() enhances code readability and maintainability.

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