code: def open(self):
          
          try:
              self.device = ConnectHandler(device_type='cisco_xr',
                                           ip=self.hostname,
                                           port=self.port,
                                           username=self.username,
                                           password=self.password,
                                           **self.netmiko_kwargs)
              self.device.timeout = self.timeout
              self._xml_agent_alive = True  # successfully open thus alive
          except NetMikoTimeoutException as t_err:
              raise ConnectError(t_err.args[0])
          except NetMikoAuthenticationException as au_err:
              raise ConnectError(au_err.args[0])
  
          self._cli_prompt = self.device.find_prompt()  # get the prompt
          self._enter_xml_mode()
docs: Open a connection to an IOS-XR device.
  
          Connects to the device using SSH and drops into XML mode.