Level 3Exercise #64

Moving average window

Return the average after each full window of size k in O(n) time.

What you’ll practice

This Level 3 exercise focuses on deque window 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:moving_average([1,3,5,7], k=2)

Output:[2.0,4.0,6.0]

Reference Solution

Reveal Reference Solution

def moving_average(values: list[int], k: int) -> list[float]:
    from collections import deque
    window, total, result = deque(), 0, []
    for value in values:
        window.append(value)
        total += value
        if len(window) > k:
            total -= window.popleft()
        if len(window) == k:
            result.append(total / k)
    return result

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Moving average window

What you’ll practice

Sample Test Cases

Further Reading

Reference Solution