def GetCalendarFieldValuesTuple(self):
    if self.start_date and self.end_date:
      return [getattr(self, fn) for fn in self._FIELD_NAMES]
On Specific Gateway due differences in response from gateway
dataset/ETHPy150Open google/transitfeed/transitfeed/serviceperiod.py/ServicePeriod.GetCalendarFieldValuesTuple--crossover with--dataset/ETHPy150Open abunsen/Paython/paython/gateways/plugnpay.py/PlugnPay.parse