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Comprehensions & generators

List/dict/set comprehensions, generator expressions, and lazy iteration.

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Comprehensions & generators easy

How to Parse Data with Generators and Comprehensions in Python

This code demonstrates using a generator expression to filter active users and a dictionary comprehension to aggregate scores by name.

generator expressions dictionary comprehensions filtering
Python 
def parse_data_helper(raw_records):
    """Extract active users' names and scores from raw records."""
    parsed = (
        (record["name"], record["score"])
        for record in raw_records
        if record["active"] and record["score"] >= 0
    )
    return list(parsed)


def aggregate_scores(parsed_data):
    "…
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