Python 学生成绩转换程序 - 将百分制成绩转换为等级

a = float(input('请输入成绩：'))

if a < 0 or a > 100: print('data error!') elif a >= 90 and a <= 100: print('A') elif a >= 80 and a < 90: print('B') elif a >= 70 and a < 80: print('C') elif a >= 60 and a < 70: print('D') else: print('E')