import json
def main_menu():
    print("请选择如下功能：")
    print("1：添加学员：")
    print("2：删除学员：")
    print("3：修改学员信息")
    print("4：查询学员信息")
    print("5：显示所有学员信息")
    print("6：保存学员信息")
    print("7:退出系统")
    print("请输入你需要的功能序号")
def add_student(students):
    name = input("请输入你的姓名: ")
    age = input("请输入你的性别: ")
    grade = input("请输入你的电话: ")
    student = { name,  age, grade}
    students.append(student)
    print("学生信息添加成功！")

def delete_student(students):
    name = input("请输入要删除的学生姓名: ")
    for student in students:
        if student["姓名"] == name:
            students.remove(student)
            print("学生信息删除成功！")
            break
    else:
        print("未找到该学生信息！")

def modify_student(students):
    name = input("请输入要修改的学生姓名: ")
    for student in students:
        if student["姓名"] == name:
            new_name = input("请输入学员姓名: ")
            new_age = input("请输入学员性别: ")
            new_grade = input("请输入学员手机号: ")
            student["姓名"] = new_name
            student["性别"] = new_age
            student["手机号"] = new_grade
            print("修改学员信息成功！")
            break
    else:
        print("未找到该学生信息！")

def save_students(students):
    with open("students.json", "w") as file:
        json.dump(students, file)
    print("学生信息保存成功！")

def load_students():
    try:
        with open("students.json", "r") as file:
            students = json.load(file)
    except FileNotFoundError:
        students = []
    return students

def query_student(students):
    name = input("请输入要查询的学生姓名: ")
    for student in students:
        if student["姓名"] == name:
            print("学生信息如下:")
            print("姓名:", student["姓名"])
            print("性别:", student["性别"])
            print("手机号:", student["手机号"])
            break
    else:
        print("未找到该学生信息！")

def display_students(students):
    if not students:
        print("暂无学生信息！")
    else:
        print("所有学生信息如下:")
        for student in students:
            print("姓名:", student["姓名"])
            print("性别:", student["性别"])
            print("手机号:", student["手机号"])

def main():
    students = load_students()

    while True:
        main_menu()
        option = input("请输入你需要的功能序号: ")

        if option == "1":
            add_student(students)
        elif option == "2":
            delete_student(students)
        elif option == "3":
            modify_student(students)
        elif option == "4":
            save_students(students)
        elif option == "5":
            query_student(students)
        elif option == "6":
            display_students(students)
        elif option == "0":
            break
        else:
            print("无效的选项，请重新输入！")