Python_练习_24.3.15

class Friend:
    def __init__(self):
        self.friend_li = {}

    # 实例方法
    def welcome(self):
        print("欢迎来到好友管理系统")
        print("1.添加好友")
        print("2.删除好友")
        print("3.展示好友")
        print("4.好友备注")
        print("5.退出系统")
        while True:
            choice = input("请输入你的选择：")
            if choice == "1":
                self.add_friend()
            elif choice == "2":
                self.del_friend()
            elif choice == "3":
                self.show_friend()
            elif choice == "4":
                self.friend_remark()
            elif choice == "5":
                self.exit_friend()
            else:
                print("输入有误，请重新输入！")

    # 添加好友
    def add_friend(self):
        name = input("请输入好友姓名：")
        if name in self.friend_li:
            print("该好友已存在！")
        else:
            self.friend_li[name] = "无备注"
            print("添加成功！")

    # 删除好友
    def del_friend(self):
        name = input("请输入要删除的好友姓名：")
        if name in self.friend_li:
            self.friend_li.pop(name)
            print("删除成功！")
        else:
            print("该好友不存在！")

    # 展示好友
    def show_friend(self):
        for i in self.friend_li:
            print("名称：", i, "备注：", self.friend_li[i])

    # 退出系统
    @staticmethod
    def exit_friend():
        print("退出系统！")
        exit(0)

    # 好友备注
    def friend_remark(self):
        name = input("请输入好友姓名：")
        if name in self.friend_li:
            remark = input("请输入好友备注：")
            self.friend_li[name] = remark
            print("修改成功！")
        else:
            print("该好友不存在！")


friend = Friend()
friend.welcome()