code: def chassis_name(self, **kwargs):
          
          namespace = "urn:brocade.com:mgmt:brocade-rbridge"
          rbridge_id = kwargs.pop('rbridge_id', '1')
          chassis_name = ' '
          callback = kwargs.pop('callback', self._callback)
          rid_args = dict(rbridge_id=rbridge_id, chassis_name=chassis_name)
          rid = getattr(self._rbridge,
                        'rbridge_id_switch_attributes_chassis_name')
          config = rid(**rid_args)
          output = callback(config, handler='get_config')
          chassis_name = output.data.find('.//{%s}chassis-name' % namespace).text
          return chassis_name
docs: Get device's chassis name/Model.
  
          Args:
              rbridge_id (str): The rbridge ID of the device
              callback (function): A function executed upon completion of the
                  method.  The only parameter passed to `callback` will be the
                  ``ElementTree`` `config`.
  
          Returns:
              Return value of `callback`.
  
          Raises:
              KeyError: if `rbridge_id` is not specified.
  
          Examples:
              >>> import pynos.device
              >>> conn = ('10.24.39.211', '22')
              >>> auth = ('admin', 'password')
              >>> with pynos.device.Device(conn=conn, auth=auth) as dev:
              ...     output = dev.system.chassis_name(rbridge_id='225')
              ...     assert output == 'VDX6740'