text: # This is the client code
  import socket
  import sys
  
  
  def login():
      ip = 'summerdesktop'  # input('Enter hostname of server : ')
      port = 9998  # input('Enter Port : ')
      welcome_msg = ('-'*20) + 'WELCOME!' + ('-'*20)
  
      client_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
      try:
          client_socket.connect((ip, int(port)))
          print('连接服务器成功！\n')
          print(welcome_msg)
      except:
          print("连接服务器出错！")
          sys.exit()
  
      username = input(' 请输入用户名: ')
      client_socket.send(username.encode())
      # print(client_socket.recv(1024).decode())
      password = input(' 请输入密码 : ')
      client_socket.send(password.encode())
      # print(client_socket.recv(1024).decode())
  
      validate_bit = client_socket.recv(1024).decode()
      if validate_bit == '0':
          print('用户名不存在或密码错误！')
          return False
          client_socket.close()
      else:
          print('登录成功！')
          return True
  