Define a function, the input is an integer between 0-100, and the output is the judgment result of excellent, good, medium, bad, and failing.

**- Define a function, the input is an integer between 0-100, and the output is the judgment result of excellent, good, medium, bad, and fail;

-In the main function, test the function of the function.

# -*- coding:utf8 -*-

def judge(chose):
    if 90 < chose <= 100:#不能用多个if，否则会多次输出 要用elif
        print("优")
    elif chose >= 80:
        print("良")
    elif chose >= 70:
        print("中")
    elif chose >= 60:
        print("差")
    elif 0 <= chose < 60:
        print("不及格")
    else:
        print("成绩错误")


def main():
    print("请输入成绩:")
    chose = int(input())
    judge(chose)

    
if __name__ == '__main__':
    main()

Remaining problem: The number entered is not judged, and an error will be reported if it is a non-integer.