[Python] 2019 KAKAO BLIND RECRUITMENT 실패율

코딩테스트 연습 - 실패율

def solution(N, stages):
    answer = []
    len_stages = len(stages)
    for i in range(1, N+1):
        cnt = stages.count(i)
        if cnt == 0:
            fail = 0
        else:
            fail = cnt / len_stages
        answer.append((i, fail))
        len_stages -= cnt
    
    answer = sorted(answer, key=lambda x:x[1], reverse=True)
    answer = [i[0] for i in answer]
    return answer