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Lists & loops

Iterate, transform, and combine sequences with readable loop patterns.

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Lists & loops easy

How to Group Consecutive Equal Elements in Python

Group consecutive equal elements in a list into sublists using itertools.groupby.

groupby itertools lists
Python 
from itertools import groupby

def group_consecutive(lst):
    """Group consecutive equal elements into sublists."""
    return [list(group) for _, group in groupby(lst)]

if __name__ == "__main__":
    input_list = [1, 1, 2, 2, 2, 3, 1, 1, 4, 4, 4, 4]
    result = group_consecutive(input_list)
    print("Input:", inp…
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