def unselect_from_list_by_value(self, locator, *values):

         """Unselects `*values` from list identified by `locator`

         Select list keywords work on both lists and combo boxes. Key attributes for

         select lists are `id` and `name`. See `introduction` for details about

         locating elements.

         """

         if not values:

             raise ValueError("No value given.")

         items_str = "value(s) '%s'" % ", ".join(values)

         self._info("Unselecting %s from list '%s'." % (items_str, locator))

         select = self._get_select_list(locator)

         if not select.is_multiple:

             raise RuntimeError("Keyword 'Unselect from list' works only for multiselect lists.")

         for value in values:

             select.deselect_by_value(value)