docs: def _parse_attributes(self, element_name, package_class, namespace=''):
          """
          Returns an instance of the package_class instantiated with a
          dictionary of the attributes from element_name in the specified
          namespace of the RSS feed.
          """
          return package_class(
              self._channel.find(
                  './/{0}{1}'.format(namespace, element_name)
              ).attrib
          )