Level 4Exercise #89

Group records by team

Return a mapping from team to its records even when input teams are interleaved.

What you’ll practice

This Level 4 exercise focuses on sorted + groupby in the Itertools curriculum. Solve the challenge prompt above using clear, idiomatic Python and the relevant language or standard-library tools.

Relevant Python reference: itertools.groupby.

Sample Test Cases

Example #1

Input:group_teams([{'team': 'red', 'v': 1}, {'team': 'blue', 'v': 2}, {'team': 'red', 'v': 3}])

Output:{'blue':[...], 'red':[...]}

Reference Solution

Reveal Reference Solution

def group_teams(records: list[dict]) -> dict[str,list[dict]]:
    from itertools import groupby
    ordered = sorted(records, key=lambda row: row['team'])
    return {team: list(group) for team, group in groupby(ordered, key=lambda row: row['team'])}

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Group records by team

What you’ll practice

Sample Test Cases

Further Reading

Reference Solution