code: def document_partition_url(self, partition_key):
          
          return '/'.join((
              self._database.database_partition_url(partition_key),
              '_design',
              url_quote_plus(self['_id'][8:], safe='')
          ))
docs: Retrieve the design document partition URL.
  
          :param str partition_key: Partition key.
          :return: Design document partition URL.
          :rtype: str