def _sort(self, short_list, sorts):
        """
        TAKE SHORTLIST, RETURN IT SORTED
        :param short_list:
        :param sorts: LIST OF SORTS TO PERFORM
        :return:
        """

        sort_values = self._index_columns(sorts)

        # RECURSIVE SORTING
        output = []
        def _sort_more(short_list, i, sorts):
            if len(sorts) == 0:
                output.extend(short_list)

            sort = sorts[0]

            index = self._index[sort_values[i]]
            if sort.sort == 1:
                sorted_keys = sorted(index.keys())
            elif sort.sort == -1:
                sorted_keys = reversed(sorted(index.keys()))
            else:
                sorted_keys = list(index.keys())

            for k in sorted_keys:
                self._sort(index[k] & short_list, i + 1, sorts[1:])

        _sort_more(short_list, 0, sorts)
        return output