Reference library

Dictionaries & sets

Key–value maps, uniqueness, counting, grouping, and fast lookups.

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Dictionaries & sets easy

How to Transform a List of Dictionaries with Sets in Python

Normalize a list of dict records — cleaning names, extracting unique tags with sets, and building a standardized result.

dictionaries sets data-normalization
Python 
def transform_data(raw_records):
    """Transform a list of dict records into normalized data with sets for unique values."""
    normalized = []
    unique_names = set()
    all_tags = set()
    
    for record in raw_records:
        # Normalize name to lowercase and strip whitespace
        name = record.get("name"…
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