code: def get_occurrence(self, instance_index):
      
  
      if not all([isinstance(i, int) for i in instance_index]):
        raise TypeError("instance_index must be an interable of type int")
  
      if self.type != 'RecurringMaster':
        raise InvalidEventType("get_occurrance method can only be called on a 'RecurringMaster' event type")
  
      body = soap_request.get_occurrence(exchange_id=self._id, instance_index=instance_index, format=u"AllProperties")
      response_xml = self.service.send(body)
  
      items = response_xml.xpath(u'//m:GetItemResponseMessage/m:Items', namespaces=soap_request.NAMESPACES)
      events = []
      for item in items:
        event = Exchange2010CalendarEvent(service=self.service, xml=deepcopy(item))
        if event.id:
          events.append(event)
  
      return events
docs: get_occurrence(instance_index)
        :param iterable instance_index: This should be tuple or list of integers which correspond to occurrences.
        :raises TypeError: When instance_index is not an iterable of ints.
        :raises InvalidEventType: When this method is called on an event that is not a RecurringMaster type.
  
        This will return a list of occurrence events.
  
        **Examples**::
  
          master = service.calendar().get_event(id='<event_id>')
  
          # The following will return the first 20 occurrences in the recurrence.
          # If there are not 20 occurrences, it will only return what it finds.
          occurrences = master.get_occurrence(range(1,21))
          for occurrence in occurrences:
            print occurrence.start