code: def stream(self, recurring=values.unset, trigger_by=values.unset,
                 usage_category=values.unset, limit=None, page_size=None):
          
          limits = self._version.read_limits(limit, page_size)
  
          page = self.page(
              recurring=recurring,
              trigger_by=trigger_by,
              usage_category=usage_category,
              page_size=limits['page_size'],
          )
  
          return self._version.stream(page, limits['limit'], limits['page_limit'])
docs: Streams TriggerInstance records from the API as a generator stream.
          This operation lazily loads records as efficiently as possible until the limit
          is reached.
          The results are returned as a generator, so this operation is memory efficient.
  
          :param TriggerInstance.Recurring recurring: The frequency of recurring UsageTriggers to read
          :param TriggerInstance.TriggerField trigger_by: The trigger field of the UsageTriggers to read
          :param TriggerInstance.UsageCategory usage_category: The usage category of the UsageTriggers to read
          :param int limit: Upper limit for the number of records to return. stream()
                            guarantees to never return more than limit.  Default is no limit
          :param int page_size: Number of records to fetch per request, when not set will use
                                the default value of 50 records.  If no page_size is defined
                                but a limit is defined, stream() will attempt to read the
                                limit with the most efficient page size, i.e. min(limit, 1000)
  
          :returns: Generator that will yield up to limit results
          :rtype: list[twilio.rest.api.v2010.account.usage.trigger.TriggerInstance]