Method format_usage

Lib/argparse.py:2779–2784

(self, formatter=None)

    # =======================

    def format_usage(self, formatter=None):
        if formatter is None:
            formatter = self._get_formatter()
        formatter.add_usage(self.usage, self._actions,
                            self._mutually_exclusive_groups)
        return formatter.format_help()

    def format_help(self, formatter=None):
        if formatter is None: