写部署脚本时，难免涉及到一些远程执行命令或者传输文件。 之前一直使用 "sh" 库，调用sh.ssh远程执行一些命令，sh.scp传输文件，但是实际使用中还是比较麻烦的，光是模拟用户登陆这一点，还需要单独定义方法模拟输入。 感受一下: 来自 "官方文档" 后来发现 "paramiko" 库更加优雅、
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