How Can I Divide a List into Equally-Sized Chunks in Python?

Equally-Sized Chunks from Arbitrary-Length Lists

Dividing a list into equally-sized segments can be a valuable operation for data processing. This article presents a concise guide to achieving this task in Python.

Using a Custom Generator

A versatile approach is to utilize a generator that yields evenly-sized chunks:

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 demonstrate its usage:

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

Output:

[[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]]

List Comprehension Variant

As an alternative, a single-line solution using list comprehension can be employed:

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

However, utilizing named functions is recommended for improved code readability.

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