def _get_timezone_parameter(self, the_timezone):
        """Gets a valid timezone parameter or raise"""
        if the_timezone == "PST":  # Very common
            return "PST8PDT"
        if the_timezone not in self.get_all_timezones():
            raise ValueError(the_timezone % "%s is not a valid timezone")
        return the_timezone
dataset/ETHPy150Open biicode/bii-server/model/epoch/utc_datetime.py/UtcDatetime._get_timezone_parameter/swapped operands of `%`