[파이썬] 문제 : 점수 입력 받아 성적(A,B,C..) 출력 함수

def check_score(n):
    rtn = ''
    if n <= 100 and n >= 90:
        rtn = 'A'
    elif n < 90 and n >= 80:
        rtn = 'B'
    elif n < 80 and n >= 70:
        rtn = 'C'
    elif n < 70 and n >= 60:
        rtn = 'D'
    elif n < 60 and n >= 50:
        rtn = 'E'
    else:
        rtn = 'F'
        
    return rtn

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