code: def parse_response(cls, response, **kwargs):
          
          if response.tag != cls.command_name:
              raise ResponseParseError(
                  "Received response of type {}, GetCommand can only parse responses of type {}".format(response.tag,
                                                                                                        cls.command_name))
  
          error = response.find('./error')
          if error is not None:
              return _parse_error_tree(error)
  
          text = response.find('./data').text
          if text:
              return base64.b64decode(six.b(text))
          else:
              return six.b('')
docs: Parse the server response for this get file command
  
          This will parse xml of the following form::
  
              <get_file>
                  <data>
                     asdfasdfasdfasdfasf
                  </data>
              </get_file>
  
          or with an error::
  
              <get_file>
                  <error ... />
              </get_file>
  
          :param response: The XML root of the response for a get file command
          :type response: :class:`xml.etree.ElementTree.Element`
          :return: a six.binary_type string of the data of a file or an :class:`~ErrorInfo` if the xml contained an error