Writes col_widths to pys file

        Format: <col>\t<tab>\t<value>\n

def _col_widths2pys(self):
        """Writes col_widths to pys file

        Format: <col>\t<tab>\t<value>\n

        """

        for col, tab in self.code_array.dict_grid.col_widths:
            if col < self.code_array.shape[1] and \
               tab < self.code_array.shape[2]:
                width = self.code_array.dict_grid.col_widths[(col, tab)]
                width_strings = map(repr, [col, tab, width])
                self.pys_file.write(u"\t".join(width_strings) + u"\n")