score = float(input("请输入你的成绩:"))if 90 <= score <= 100: print("你的成绩为A档")elif 80 <= score < 90: print("你的成绩为B档")elif 70 <= score < 80: print("你的成绩为C档")elif 60 <= score < 70: print("你的成绩为D档")else: print("对不起,你的成绩不合格!")