编写可以实现学生成绩简单管理系统。本系统主要实现以下功能：( 1)录入学生信息。(2)按学号查询学生信息。(3)按姓名查询学生信息。(4)添加一个学生信息。(5)按学号删除学生信息(6)按学号修改学生信息(7)显示所有学生信息(8)按课程排序(有高到底)输出显示学生信息(9)按分数段统计学生信息( 10)退出系统【设计要求】( 1) 以上功能通过菜单实现：(2) 通过输出菜单中的数字，完成相应的操作：

好的，我可以为你编写一个学生成绩简单管理系统，实现以上功能，你只需要按照菜单中的数字进行相应操作即可。

下面是程序的代码实现：

import sys

class Student:
    def __init__(self, id, name, gender, age, course1, course2, course3):
        self.id = id
        self.name = name
        self.gender = gender
        self.age = age
        self.course1 = course1
        self.course2 = course2
        self.course3 = course3
        self.score = course1 + course2 + course3

    def show_info(self):
        print("学号：", self.id)
        print("姓名：", self.name)
        print("性别：", self.gender)
        print("年龄：", self.age)
        print("课程1成绩：", self.course1)
        print("课程2成绩：", self.course2)
        print("课程3成绩：", self.course3)
        print("总成绩：", self.score)
        print()

def add_student(students):
    print("请输入学生信息：")
    id = input("学号：")
    name = input("姓名：")
    gender = input("性别：")
    age = input("年龄：")
    course1 = int(input("课程1成绩："))
    course2 = int(input("课程2成绩："))
    course3 = int(input("课程3成绩："))
    student = Student(id, name, gender, age, course1, course2, course3)
    students.append(student)
    print("学生信息添加成功！")

def find_student_by_id(students, id):
    for student in students:
        if student.id == id:
            student.show_info()
            return
    print("找不到学号为{}的学生！".format(id))

def find_student_by_name(students, name):
    for student in students:
        if student.name == name:
            student.show_info()
    print("找不到姓名为{}的学生！".format(name))

def delete_student(students, id):
    for student in students:
        if student.id == id:
            students.remove(student)
            print("学生信息删除成功！")
            return
    print("找不到学号为{}的学生！".format(id))

def modify_student(students, id):
    for student in students:
        if student.id == id:
            print("请输入修改后的学生信息：")
            student.name = input("姓名：")
            student.gender = input("性别：")
            student.age = input("年龄：")
            student.course1 = int(input("课程1成绩："))
            student.course2 = int(input("课程2成绩："))
            student.course3 = int(input("课程3成绩："))
            student.score = student.course1 + student.course2 + student.course3
            print("学生信息修改成功！")
            return
    print("找不到学号为{}的学生！".format(id))

def show_all_students(students):
    if len(students) == 0:
        print("暂无学生信息！")
    else:
        for student in students:
            student.show_info()

def sort_by_course(students):
    students.sort(key=lambda x:x.score, reverse=True)

def stat_by_score(students):
    count1 = count2 = count3 = count4 = 0
    for student in students:
        if student.score >= 300:
            count1 += 1
        elif student.score >= 200:
            count2 += 1
        elif student.score >= 100:
            count3 += 1
        else:
            count4 += 1
    print("300分以上：{}人".format(count1))
    print("200分以上：{}人".format(count2))
    print("100分以上：{}人".format(count3))
    print("100分以下：{}人".format(count4))

def main():
    students = []
    while True:
        print("欢迎使用学生成绩管理系统！")
        print("1. 录入学生信息")
        print("2. 按学号查询学生信息")
        print("3. 按姓名查询学生信息")
        print("4. 添加一个学生信息")
        print("5. 按学号删除学生信息")
        print("6. 按学号修改学生信息")
        print("7. 显示所有学生信息")
        print("8. 按课程排序输出学生信息")
        print("9. 按分数段统计学生信息")
        print("10. 退出系统")
        choice = int(input("请选择："))
        if choice == 1:
            add_student(students)
        elif choice == 2:
            id = input("请输入学号：")
            find_student_by_id(students, id)
        elif choice == 3:
            name = input("请输入姓名：")
            find_student_by_name(students, name)
        elif choice == 4:
            add_student(students)
        elif choice == 5:
            id = input("请输入学号：")
            delete_student(students, id)
        elif choice == 6:
            id = input("请输入学号：")
            modify_student(students, id)
        elif choice == 7:
            show_all_students(students)
        elif choice == 8:
            sort_by_course(students)
            show_all_students(students)
        elif choice == 9:
            stat_by_score(students)
        elif choice == 10:
            print("感谢使用学生成绩管理系统！")
            sys.exit()
        else:
            print("输入错误，请重新输入！")

if __name__ == '__main__':
    main()

你只需要运行这个程序，按照菜单选择相应功能，就可以实现学生成绩的管理。