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