用python写一个系统

这是一个简单的Python系统示例，用于管理学生信息：

class Student:
    def __init__(self, name, age, grade):
        self.name = name
        self.age = age
        self.grade = grade

class StudentManagementSystem:
    def __init__(self):
        self.students = []

    def add_student(self, name, age, grade):
        student = Student(name, age, grade)
        self.students.append(student)
        print("学生信息已添加！")

    def remove_student(self, name):
        for student in self.students:
            if student.name == name:
                self.students.remove(student)
                print("学生信息已删除！")
                return
        print("找不到该学生！")

    def display_students(self):
        if len(self.students) == 0:
            print("暂无学生信息！")
        else:
            for student in self.students:
                print(f"姓名: {student.name}, 年龄: {student.age}, 成绩: {student.grade}")

    def run(self):
        while True:
            print("欢迎使用学生信息管理系统！")
            print("请选择操作：")
            print("1. 添加学生信息")
            print("2. 删除学生信息")
            print("3. 显示所有学生信息")
            print("0. 退出系统")

            choice = input("请选择：")
            if choice == "1":
                name = input("请输入学生姓名：")
                age = input("请输入学生年龄：")
                grade = input("请输入学生成绩：")
                self.add_student(name, age, grade)
            elif choice == "2":
                name = input("请输入要删除的学生姓名：")
                self.remove_student(name)
            elif choice == "3":
                self.display_students()
            elif choice == "0":
                print("谢谢使用！")
                break
            else:
                print("无效选择，请重新选择！")

system = StudentManagementSystem()
system.run()

这个系统允许用户添加、删除和显示学生信息。用户可以通过输入相应的选项来操作系统