1 student_grade = int(input("print in number:")) 2 3 if student_grade < 60: 4 print(‘不及格‘) 5 elif 60 >= student_grade < 70: 6 print(‘及格‘) 7 elif 70 >= student_grade < 80: 8 print(‘良好‘) 9 elif 80 >= student_grade <= 100: 10 print(‘优秀‘) 11 12 else: 13 print(‘输入有误‘)
原文：https://www.cnblogs.com/xiaoliangliu86/p/11418419.html