def process(self, argv=sys.argv, ifile=sys.stdin, ofile=sys.stdout):
        """ Process data.

        :param argv: Command line arguments.
        :type argv: list or tuple

        :param ifile: Input data file.
        :type ifile: file

        :param ofile: Output data file.
        :type ofile: file

        :return: :const:`None`
        :rtype: NoneType

        """
        if len(argv) > 1:
            self._process_protocol_v1(argv, ifile, ofile)
        else:
            self._process_protocol_v2(argv, ifile, ofile)
Process data.

        :param argv: Command line arguments.
        :type argv: list or tuple

        :param ifile: Input data file.
        :type ifile: file

        :param ofile: Output data file.
        :type ofile: file

        :return: :const:`None`
        :rtype: NoneType