How to use the pycm.pycm_ci.__CI_overall_handler__ function in pycm

if alpha in ALPHA_ONE_SIDE_TABLE.keys():
                    CV = ALPHA_ONE_SIDE_TABLE[alpha]
                else:
                    CV = ALPHA_ONE_SIDE_TABLE[0.05]
                    warn(CI_ALPHA_ONE_SIDE_WARNING, RuntimeWarning)
            else:
                if alpha in ALPHA_TWO_SIDE_TABLE.keys():
                    CV = ALPHA_TWO_SIDE_TABLE[alpha]
                else:
                    CV = ALPHA_TWO_SIDE_TABLE[0.05]
                    warn(CI_ALPHA_TWO_SIDE_WARNING, RuntimeWarning)
            param_u = param.upper()
            if param_u in CI_CLASS_LIST:
                return __CI_class_handler__(self, param_u, CV, method)
            if param in CI_OVERALL_LIST:
                return __CI_overall_handler__(self, param, CV, method)
            raise pycmCIError(CI_SUPPORT_ERROR)
        raise pycmCIError(CI_FORMAT_ERROR)