code: def parent(self):
          
          if self._parent is None:
              self._parent = self._make_parent()
  
          return self._parent
docs: The parent of the current key.
  
          :rtype: :class:`google.cloud.datastore.key.Key` or :class:`NoneType`
          :returns: A new ``Key`` instance, whose path consists of all but the
                    last element of current path. If the current key has only
                    one path element, returns ``None``.