code: def _prepare_header_cells(self, table_header):
          
  
          cells = self.parser.find(table_header).find_children(
              'tr'
          ).find_children('th').list_results()
          for cell in cells:
              self.id_generator.generate_id(cell)
  
              cell.set_attribute('scope', 'col')
docs: Set the scope of header cells of table header.
  
          :param table_header: The table header.
          :type table_header: hatemile.util.html.htmldomelement.HTMLDOMElement