[파이썬🐍] 프로그래머스 : 실패율

def solution(N, stages):
    fail_rate = {}
    total = len(stages)

    for stage in range(1, N+1):
        if total != 0:
            fail_user = stages.count(stage)
            fail_rate[stage] = fail_user / total
            total -= fail_user
        else:
            fail_rate[stage] = 0

    return sorted(fail_rate, key=lambda x : fail_rate[x], reverse=True)