def options_formatting(self):
        """ Formating options """
        group = self.parser.add_argument_group("Format")
        group.add_argument(
            "--format", dest="formatting", default=None,
            help="Custom output format using the {} expansion")
        group.add_argument(
            "--value", dest="values", action="append", default=[],
            help="Values for the custom formatting string")