def _normalize_period(self, period):
        start = self._normalize_datetime(period.start)
        year_offset = period.end.year % period.start.year
        end = self._normalize_datetime(period.end, year_offset)
        return Period(start, end)
dataset/ETHPy150Open impactlab/eemeter/eemeter/weather.py/TMY3WeatherSource._normalize_period/operator `-` -> `%`