def mingpian():

     name = []

     name_fl = 0

     while name_fl == 0:

         print("="*50)

         print("        欢迎进入名片管理系统V2.0")

         print("1：添加一个名片")

         print("2：修改一个名片")

         print("3：删除一个名片")

         print("4：查询一个名片")

         print("5：退出")

         print("="*50)

         admin = int(input("请输入功能编号："))

         if admin == 1:

             while True:

                 new_name = input("请输入你的名字：")

                 if new_name == "返回":

                     break

                 name.append(new_name)

                 print("=======>添加成功！")

                 print("=======>目前已添加的名字有：%s"%(name))

                 print("=======>返回菜单请输入：返回")

         elif admin == 2:

             while True:

                 al_name = input("请输入你要修改的名字：")

                 if al_name == "返回":

                     break

                 if al_name in name:

                     als_name = input("请输入新名字：")

                     name.remove(al_name)

                     name.append(als_name)

                     print("=======>目前的名字有：%s" % (name))

                 else:

                     print("您输入的名字不存在，请重新输入！")

                 print("=======>返回菜单请输入：返回")

         elif admin == 3:

             while True:

                 del_name = input("请输入你要删除的名字：")

                 if del_name == "返回":

                     break

                 name.remove(del_name)

                 print("=======>删除成功！")

                 print("=======>目前已剩余的名字有：%s" % (name))

                 print("=======>返回菜单请输入：返回")

         elif admin == 4:

             while True:

                 look_name = input("请输入你要查询的名字：")

                 if look_name == "返回":

                     break

                 else:

                     if look_name in name:

                         print("你要查询的名字存在！")

                     else:

                         print("查无此人！")

                 print("=======>返回菜单请输入：返回")

         elif admin == 5:

             name_fl =1

         else:

             print("你的输入有误，请从新输入！")

         #=====登录注册

 ad = {}

 name_fl = 0

 while name_fl == 0:

     print("="*50)

     print("欢迎使用名片管理系统V2.0")

     print("1.登录")

     print("2.注册")

     print("3.退出")

     print("="*50)

     admin_1 = int(input("请输入功能编号："))

     if admin_1 == 1:

         while name_fl == 0:

             admin = input("请输入登录账号：")

             passwd = input("请输入登录密码：")

             for admins,passwds in ad.items():

                 if admin == admins and passwd == passwds:

                     print("登录成功！")

                     mingpian()

                     name_fl = 1

                     print("感谢使用，再见！")

                 else:

                     print("账号或密码错误！请重新登录！")

     elif admin_1 == 2:

         while True:

             new_zh = input("请输入注册账号：")

             if new_zh in ad.keys():

                 print("账号已存在！请从新输入！")

             else:

                 new_passwd = input("请输入注册密码：")

                 ad[new_zh] = new_passwd

                 print("注册成功！")

                 break

     elif admin_1 ==3:

         print("感谢使用名片管理系统V2.0，再见！")

     else:

          print("输入错误，请重新输入！")