code: def result(self):
          
          if self.__result:
              return self.__result
          data = self.rdb.rpop(self.urn)
          if data:
              self.rdb.delete(self.urn)
              data = json.loads(data)
              self.__result = data
              return data
          else:
              return None
docs: Returns the result from the worker for this job. This is used to pass
          result in async way.