def GetCalendarFieldValuesTuple(self):
    if self.start_date and self.end_date:
      return [getattr(self, fn) for fn in self._FIELD_NAMES]
Return the tuple of calendar.txt values or None if this ServicePeriod
dataset/ETHPy150Open google/transitfeed/transitfeed/serviceperiod.py/ServicePeriod.GetCalendarFieldValuesTuple