Level 4Exercise #86

Take from an infinite cycle

Return the first n values from a repeating pattern without an infinite loop.

What you’ll practice

This Level 4 exercise focuses on cycle + islice 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.islice, itertools.cycle.

Sample Test Cases

Example #1

Input:repeat_pattern(['A','B'], n=5)

Output:['A','B','A','B','A']

Reference Solution

Reveal Reference Solution

def repeat_pattern(pattern: list[str], n: int) -> list[str]:
    from itertools import cycle, islice
    return list(islice(cycle(pattern), n))

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Take from an infinite cycle

What you’ll practice

Sample Test Cases

Further Reading

Reference Solution