Guacamole method used by the argparse ingredient.

        :param parser:
            Argument parser (from :mod:`argparse`) specific to this command.

def register_arguments(self, parser):
        """
        Guacamole method used by the argparse ingredient.

        :param parser:
            Argument parser (from :mod:`argparse`) specific to this command.
        """
        parser.add_argument('x', type=int, help='the first value')
        parser.add_argument('y', type=int, help='the second value')