def __make_stpd_file(self):
        ''' stpd generation using Stepper class '''
        self.log.info("Making stpd-file: %s", self.stpd)
        stepper = Stepper(
            self.core,
            rps_schedule=self.load_profile.schedule if self.load_profile.is_rps() else None,
            http_ver=self.http_ver,
            ammo_file=self.ammo_file,
            instances_schedule=self.load_profile.schedule if self.load_profile.is_instances() else None,
            instances=self.instances,
            loop_limit=self.loop_limit,
            ammo_limit=self.ammo_limit,
            uris=self.uris,
            headers=[header.strip('[]') for header in self.headers],
            autocases=self.autocases,
            enum_ammo=self.enum_ammo,
            ammo_type=self.ammo_type,
            chosen_cases=self.chosen_cases,
            use_cache=self.use_caching)
        with open(self.stpd, 'w', self.file_cache) as os:
            stepper.write(os)
stpd generation using Stepper class