Level 3Exercise #62

Keep only recent logs

Keep the latest n log messages while streaming through all logs.

What you’ll practice

This Level 3 exercise focuses on deque(maxlen) in the Collections curriculum. Solve the challenge prompt above using clear, idiomatic Python and the relevant language or standard-library tools.

Relevant Python reference: collections.deque.

Sample Test Cases

Example #1

Input:recent(['a','b','c','d'], n=3)

Output:['b','c','d']

Reference Solution

Reveal Reference Solution

def recent(logs: list[str], n: int) -> list[str]:
    from collections import deque
    return list(deque(logs, maxlen=n))

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Keep only recent logs

What you’ll practice

Sample Test Cases

Further Reading

Reference Solution