code: def close(self):
          
          if self._closed:
              raise ProgrammingError('the cursor is already closed')
          if self._id is not None:
              self._connection._client.close_statement(self._connection._id, self._id)
              self._id = None
          self._signature = None
          self._column_data_types = []
          self._frame = None
          self._pos = None
          self._closed = True
docs: Closes the cursor.
          No further operations are allowed once the cursor is closed.
  
          If the cursor is used in a ``with`` statement, this method will
          be automatically called at the end of the ``with`` block.