code: def start_stream(self):
          
  
          tracking_terms = self.term_checker.tracking_terms()
  
          if len(tracking_terms) > 0 or self.unfiltered:
              # we have terms to track, so build a new stream
              self.stream = tweepy.Stream(self.auth, self.listener,
                                          stall_warnings=True,
                                          timeout=90,
                                          retry_count=self.retry_count)
  
              if len(tracking_terms) > 0:
                  logger.info("Starting new twitter stream with %s terms:", len(tracking_terms))
                  logger.info("  %s", repr(tracking_terms))
                  
                  # Launch it in a new thread
                  self.stream.filter(track=tracking_terms, async=True, languages=self.languages)
              else:
                  logger.info("Starting new unfiltered stream")
                  self.stream.sample(async=True, languages=self.languages)
docs: Starts a stream with teh current tracking terms