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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def _row_generator(self, cursor):
 """ Yields individual rows until no more rows exist in query result. Applies row formatter if such exists. """

        rowset = cursor.fetchmany(self._arraysize)
        while rowset:
            if self._row_formatter is not None:
                rowset = (self._row_formatter(r, cursor) for r in rowset)
            for row in rowset:
                yield row
            rowset = cursor.fetchmany(self._arraysize)