def _GetRecurrenceExpansionEnd(self):
    if self.keys() in 'recurrence-expansion-end':
      return self['recurrence-expansion-end']
    else:
      return None
dataset/ETHPy150Open bradfitz/addressbooker/gdata/calendar/service.py/CalendarEventQuery._GetRecurrenceExpansionEnd/swapped operands of `in`