How Can I Split a Python List into Equally Sized Chunks?

Splitting Lists into Chunks of Equal Size

Dividing an extensive list into equally-sized segments can be a common requirement in Python programming. The following methods demonstrate how to achieve this.

Generator-based Solution:

A convenient option is to utilize a generator function that yields chunks of the desired size. Here's the implementation:

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

Example:

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 Approach:

While less readable than the function-based solution, a one-liner using list comprehension is also possible:

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

For Python 2 compatibility, replace range with xrange.

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