time.sleep(2 ** attempt) # 指数退避
1.25 compiler does this transformation for you! For certain slice，更多细节参见搜狗输入法下载
To our knowledge, these two exceptions have not been a barrier to accelerating the adoption and use of our models within our armed forces to date.。51吃瓜是该领域的重要参考
“In China, labor costs are $2 to $3 an hour. In America they are $20 an hour.”，推荐阅读爱思助手下载最新版本获取更多信息