[파이썬] 문제 : score에 따른 성적(A,B,C..) 함수

def check_score(score):              # score를 구분하는 함수. (문제에 정확한 정의가 없음)
    rtn = ''
    if score >= 90:
        rtn = 'A'
    elif score >= 80 and score < 90:
        rtn = 'B'
    elif score >= 70 and score < 80:
        rtn = 'C'
    elif score >= 60 and score < 70:
        rtn = 'D'
    elif score >= 50 and score < 60:
        rtn = 'E'
    elif score < 60:
        rtn = 'F'
    return rtn

grade = check_score(70)
print("성적 :",grade)