def _prepend_country_code(self, value, transformations, country_code):
        for rex, trf in transformations:
            match = rex.search(value)
            if match:
                return ((country_code,) + match.groups()) % trf
        return value
dataset/ETHPy150Open formencode/formencode/formencode/national.py/InternationalPhoneNumber._prepend_country_code/swapped operands of `%`