Slicing bytes copies. On a small payload nobody notices, but slice a large packet or image buffer in a loop and the copies ...

所以这篇我打算换个思路，不是单纯讲telnet命令怎么用，也不是扔一段Python代码就跑，而是把整个链路从环境准备到脚本落地到排错，完整走一遍。如果你正好在搞网络设备批量配置、光猫调试、服务器端口探测，或者单纯想把telnet命令怎么用这件事用Python自动化掉，这篇应该能让你少走不少弯路。

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