Method print_usage

Lib/argparse.py:2826–2836

(self, file=None)

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

    def print_usage(self, file=None):
        if file is None:
            file = _sys.stdout
        formatter = self._get_formatter(file=file)
        try:
            usage_text = self.format_usage(formatter=formatter)
        except TypeError:
            # Backward compatibility for formatter classes that
            # do not accept the 'formatter' keyword argument.
            usage_text = self.format_usage()
        self._print_message(usage_text, file)

    def print_help(self, file=None):
        if file is None: