def METHOD_NAME(self):
    """Save all saveables when shutting down."""
    for key in self.saveables:
        try:
            self.save(key, is_exit=True)
        except OSError as e:
            error.handle_fatal_exc(
                e, "Error while saving!",
                pre_text="Error while saving {}".format(key),
                no_err_windows=objects.args.no_err_windows)