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

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

    def add_student(self, name, age, gender,phone):
        student = Student(name, age, gender,phone)
        self.students.append(student)
        self.save_changes()

    def delete_student(self, name):
        for student in self.students:
            if student.name == name:
                self.students.remove(student)
                self.save_changes()
                return

    def modify_student(self, name, new_age, new_gender,new_phone):
        for student in self.students:
            if student.name == name:
                student.age = new_age
                student.gender = new_gender
                student.phone = new_phone
                self.save_changes()
                return

    def save_changes(self):
        # 实现保存操作
        pass

    def search_student(self, name):
        for student in self.students:
            if student.name == name:
                return student
        return None

    def display_students(self):
        for student in self.students:
            print(f"姓名：{student.name}，年龄：{student.age}，性别：{student.gender}，电话：{student.phone}")

    def main_menu(self):
        while True:
            print("===== 学生信息管理系统 =====")
            print("1. 添加学员信息")
            print("2. 删除学员信息")
            print("3. 修改学员信息")
            print("4. 保存操作")
            print("5. 查询学员信息")
            print("6. 显示学员信息")
            print("7. 退出系统")
            choice = input("请输入您的选择：")
            if choice == "1":
                name = input("请输入学员姓名：")
                age = input("请输入学员年龄：")
                gender = input("请输入学员性别：")
                phone = input("请输入电话：")
                self.add_student(name, age, gender,phone)
            elif choice == "2":
                name = input("请输入要删除的学员姓名：")
                self.delete_student(name)
            elif choice == "3":
                name = input("请输入要修改的学员姓名：")
                new_age = input("请输入新的年龄：")
                new_gender = input("请输入新的性别：")
                new_phone = input("请输入新的电话：")
                self.modify_student(name, new_age, new_gender,new_phone)
            elif choice == "4":
                self.save_changes()
            elif choice == "5":
                name = input("请输入要查询的学员姓名：")
                student = self.search_student(name)
                if student:
                    print(f"姓名：{student.name}，年龄：{student.age}，性别：{student.gender}，电话：{student.phone}")
                else:
                    print("未找到该学员信息")
            elif choice == "6":
                self.display_students()
            elif choice == "7":
                print("感谢使用，再见！")
                break
            else:
                print("无效的选择，请重新输入")

# 实例化学生信息管理系统
hh = StudentManagementSystem()
# 运行主菜单
hh.main_menu()