Count performance

count_perf.py

def a(n: int) -> int:
    records = 0
    for _ in range(n):
        for _ in range(n):
            for _ in range(n):
                records += 1
    return records


def sum_a(n: int) -> int:
    return sum(1 for _ in range(n) for _ in range(n) for _ in range(n))


def len_a(n: int) -> int:
    return len([1 for _ in range(n) for _ in range(n) for _ in range(n)])


if __name__ == '__main__':
    import timeit

    print(timeit.timeit('a(10)', setup='from main import a', number=10000))
    print(timeit.timeit('sum_a(10)', setup='from main import sum_a', number=10000))
    print(timeit.timeit('len_a(10)', setup='from main import len_a', number=10000))