students = {}


def add_student():
    name = input("请输入学生姓名: ")
    sex = input("请输入学生性别: ")
    grade = input("请输入学生电话: ")
    students[name] = {"性别": sex, "电话": grade}
    print("{},{},{}".format(name,sex,grade))
    print(f"添加成功！\n")


def delete_student():
    name = input("请输入要删除的学生姓名: ")
    if name in students:
        del students[name]
        print(f"删除成功！\n")
    else:
        print(f"未找到该学生！\n")


def modify_student():
    name = input("请输入要修改的学生姓名: ")
    if name in students:
        sex = input("请输入新的性别: ")
        grade = input("请输入新的电话: ")
        students[name]["性别"] = sex
        students[name]["电话"] = grade
        print(f"修改成功！\n")
    else:
        print(f"未找到该学生！\n")


def save_data():
    with open("students.txt", "w") as f:
        for name, info in students.items():
            f.write(f"{name}: {info}\n")
        print(f"数据保存成功！\n")


def load_data():
    with open("students.txt", "r") as f:
        students = {}
        for line in f.readlines():
            name, info = line.strip().split(": ")
            students[name] = {"性别": info.split()[0], "电话": info.split()[1]}
        print(f"数据加载成功！\n")


def search_student():
    name = input("请输入要查询的学生姓名: ")
    if name in students:
        print(f"学生信息：\n姓名：{name}\n性别：{students[name]['性别']}\n电话：{students[name]['电话']}\n")
    else:
        print(f"未找到该学生！\n")


def display_students():
    if len(students) == 0:
        print("学生信息为空！\n")
    else:
        for name, info in students.items():
            print(f"姓名：{name}\n性别：{info['性别']}\n电话：{info['电话']}\n")


def main():
    while True:
        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")
        choice = input("请输入您需要的功能序号：")
        if choice == "1":
            add_student()
        elif choice == "2":
            delete_student()
        elif choice == "3":
            modify_student()
        elif choice == "4":
            search_student()
        elif choice == "5":
            display_students()
        elif choice == "6":
            save_data()
        elif choice == "7":
            print("谢谢使用！")
            break
        else:
            print("输入有误，请重新输入！")
main()