code: def statistics(self):
          
          if self._statistics is None:
              self._statistics = TaskStatisticsList(
                  self._version,
                  assistant_sid=self._solution['assistant_sid'],
                  task_sid=self._solution['sid'],
              )
          return self._statistics
docs: Access the statistics
  
          :returns: twilio.rest.autopilot.v1.assistant.task.task_statistics.TaskStatisticsList
          :rtype: twilio.rest.autopilot.v1.assistant.task.task_statistics.TaskStatisticsList