def list_of_list(self):
        """
        This will convert the data from a list of dict to a list of list
        :return: list of dict
        """
        ret = [[row.get(key, '') for key in self._col_names] for row in self]
        return ReprListList(ret, col_names=self._col_names,
                            col_types=self._col_types,
                            width_limit=self._width_limit,
                            digits=self._digits,
                            convert_unicode=self._convert_unicode)
This will convert the data from a list of dict to a list of list
        :return: list of dict