def __missing__(self, key):
        if self.default_factory is None:
            raise KeyError(key)
        else:
            ret = self[key] = self.default_factory(name=key)
            return ret
def on_btn_del_row_clicked(self):
        min_row, max_row, _, _ = self.ui.tblFuzzingValues.selection_range()
        self.delete_lines(min_row, max_row)