code: def parse_plays_stream(self):
          
          
          lx_doc = self.html_doc()
          if lx_doc is not None:
              parser = PlayParser(self.game_key.season, self.game_key.game_type)
              plays = lx_doc.xpath('//tr[@class = "evenColor"]')
              for p in plays:
                  p_obj = parser.build_play(p)
                  self.plays.append(p_obj)
                  
                  yield p_obj
docs: Generate and yield a stream of parsed plays. Useful for per play processing.