python使用类名实现学生成绩管理系统

以下是使用类名实现学生成绩管理系统的示例代码：

class Student:
    def __init__(self, student_id, name, score):
        self.student_id = student_id
        self.name = name
        self.score = score

class StudentManagerSystem:
    student_list = []
    student_dict = {}

    def add_student(self, student_id, name, score):
        student = Student(student_id, name, score)
        self.student_list.append(student)
        self.student_dict[student_id] = student

    def delete_student(self, student_id):
        if student_id in self.student_dict:
            student = self.student_dict.pop(student_id)
            self.student_list.remove(student)

    def update_student(self, student_id, name, score):
        if student_id in self.student_dict:
            student = self.student_dict[student_id]
            student.name = name
            student.score = score

    def search_student(self, student_id):
        if student_id in self.student_dict:
            student = self.student_dict[student_id]
            return f"学号：{student.student_id}，姓名：{student.name}，成绩：{student.score}"
        else:
            return "学生不存在"

    def display_menu(self):
        print("1. 添加学生")
        print("2. 删除学生")
        print("3. 修改学生信息")
        print("4. 查询学生信息")
        print("5. 退出系统")

    def start(self):
        while True:
            self.display_menu()
            choice = input("请输入操作编号：")
            if choice == "1":
                student_id = input("请输入学号：")
                name = input("请输入姓名：")
                score = input("请输入成绩：")
                self.add_student(student_id, name, score)
                print("添加成功")
            elif choice == "2":
                student_id = input("请输入要删除的学号：")
                self.delete_student(student_id)
                print("删除成功")
            elif choice == "3":
                student_id = input("请输入要修改的学号：")
                name = input("请输入新的姓名：")
                score = input("请输入新的成绩：")
                self.update_student(student_id, name, score)
                print("修改成功")
            elif choice == "4":
                student_id = input("请输入要查询的学号：")
                result = self.search_student(student_id)
                print(result)
            elif choice == "5":
                print("退出系统")
                break
            else:
                print("输入有误，请重新输入")

# 使用示例
system = StudentManagerSystem()
system.start()