Reference library

Lists & loops

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

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Lists & loops easy

How to Build a Frequency Map from a List in Python

This code builds a dictionary that maps each unique element in a list to its count using the Counter class from the collections module.

counter frequency dictionary
Python 
from collections import Counter

def build_frequency_map(values):
    """Return a dictionary mapping each unique value to its frequency."""
    return dict(Counter(values))

if __name__ == "__main__":
    data = ["apple", "banana", "apple", "cherry", "banana", "apple"]
    freq_map = build_frequency_map(data)
    prin…
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