code: def get_parent(self):
          
          if self._parent and self._parent.object_id == self.parent_id:
              return self._parent
          else:
              if self.parent_id:
                  return self.drive.get_item(self.parent_id)
              else:
                  # return the drive
                  return self.drive
docs: the parent of this DriveItem
  
          :return: Parent of this item
          :rtype: Drive or drive.Folder