How to use the ttp.ttp._parser_class function in ttp

def __init__(self, task_queue, results_queue, lookups, vars, groups, macro_text):
        Process.__init__(self)
        self.task_queue = task_queue
        self.results_queue = results_queue
        self.macro_text = macro_text
        self.parserObj = _parser_class(lookups, vars, groups)

def __parse_in_one_process(self):
        """Method to parse data in single process, each data item parsed
        against each template and results saved in results list
        """
        log.info("ttp.parse: parse using single process")
        for template in self._templates:
            _ttp_["macro"] = template.macro
            _ttp_["template_obj"] = template
            parserObj = _parser_class(
                lookups=template.lookups, vars=template.vars, groups=template.groups
            )
            if template.results_method.lower() == "per_input":
                for input_name, input_obj in template.inputs.items():
                    for datum in input_obj.data:
                        parserObj.set_data(
                            datum, main_results={}, input_functions=input_obj.functions
                        )
                        parserObj.parse(groups_indexes=input_obj.groups_indexes)
                        result = parserObj.main_results
                        template.form_results(result)
            elif template.results_method.lower() == "per_template":
                results_data = {}
                for input_name, input_obj in template.inputs.items():
                    for datum in input_obj.data:
                        parserObj.set_data(