Reference library

Lists & loops

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

1 match
Lists & loops easy

Find All Occurrences of an Item in a Python List

Loop through a list with enumerate() to collect the index of every match for a target value.

list enumerate loops
Python 
def find_all(data, target):
    """Return indices of every occurrence of target in a list."""
    indices = []
    for index, item in enumerate(data):
        if item == target:
            indices.append(index)
    return indices


if __name__ == "__main__":
    sample = [10, 20, 30, 20, 40, 20, 50]
    target_value …
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