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Use Python To SSH To Your Machine
================================================================================
It is time for some python programming. I love automating stuff and this time I will show you guys how to connect to your machine via **ssh using python** and run command on it. It is not hard, but at the same time not very easy to do this in python, since there are many modules and libraries to do this task. Are you curious about the module we will use in this tutorial?
We will use pxssh class of the pexpect module in Python which is used to to take care of some of the automation needs, like ssh and ftp. Do you want to make your sysadmin lifestyle as easy as possible? Then, why don’t you focus on this tutorial and try to learn as much as possible? Ok ,ok, i got your attention now, so let me give you guys a simple description about pxssh. You can also get information about pxssh by typing help(pxssh) after importing it in a python interactive shell.
**Pxssh Description**
Pxssh is based on pexpect. It’s class extends pexpect.spawn to specialize setting up SSH connections. I use pxssh frequently for making ssh connections in python. Pxssh uses the shell prompt to synchronize output from the remote host. In order to make this more robust it sets the shell prompt to something more unique than just $ or #. This should work on most Borne/Bash or Csh style shells.
You can read more about pxssh [here][1].
Now let the fun begin.
In the first step, we import everything we need and assign machine details to variables like shown in Figure 1.
![](http://180016988.r.cdn77.net/wp-content/uploads/2013/10/ssh1.png)
Figure 1
Then we create a function which will use pxssh to create and start a connection with the ssh server.
![](http://180016988.r.cdn77.net/wp-content/uploads/2013/10/ssh2.png)
Figure 2
Study carefully how we use try and except so we can handle errors. Read more about error handling in python here.
What is the next step?
The next step is to create a function which will send the command to the machine after the ssh connection between two machines is established.
![](http://180016988.r.cdn77.net/wp-content/uploads/2013/10/ssh3.png)
Figure 3
![](http://180016988.r.cdn77.net/wp-content/uploads/2013/10/ssh4.png)
Figure 4
Now close the file and save it. It is ready to run.
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[1]:http://pexpect.sourceforge.net/pxssh.html

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用Python来SSH到你的机器
================================================================================
是时间写点python代码了.我爱自动化的东西,这个时候我将告诉大家怎么通过**ssh using python**和命令连接你的机器.这不难,但是用python来做也不是很简单,因为要用很多模块和库来完成这个任务. 你是不是很好奇本教程将会使用什么模块?
我们将使用Python中的pxssh类和pexpect模块,它被用来对付一些自动化的需求,比如ssh和ftp.你想使你的系统管理生活尽可能的简单吗?那么,为什么不集中注意在本教程并且尝试尽可能多的学习?Ok,ok,我现在得到你的注意了,让我给你们一些关于pxssh简单的描述.你可以键入hepl(pxssh)得到更多关于pxssh的信息,之后把它import到一个python交互shell.
**Pxssh 描述**
Pxssh 基于pexpect.它的类扩展pexpect.spawn专门用来设置SSH连接.我经常使用python的pxssh进行ssh连接. Pxssh 使用shell命令提示从远程主机来同步输出.为了使这更牛x把shell提示符设置的更独特的一点,不仅仅用$或#.这应该可以在大多数Borne/bash或csh shell上工作.
你可以在[这里][1]看到更多关于pxssh.
现在开始欢乐吧.
第一步,我们import我们需要需要的一切并且给机器细目分配变量,就像图解1.
![](http://180016988.r.cdn77.net/wp-content/uploads/2013/10/ssh1.png)
图解 1
之后我们创建一个函数来用pxssh建立并开始一个shh服务连接
![](http://180016988.r.cdn77.net/wp-content/uploads/2013/10/ssh2.png)
图解 2
仔细学习我们是是怎么用try和except来处理错误的.在这里可以阅读更多关于python的错误处理.
下一步是什么?
下一步是在两个机器的连接建立之后.创建一个函数来给机器发送命令.
![](http://180016988.r.cdn77.net/wp-content/uploads/2013/10/ssh3.png)
图解 3
![](http://180016988.r.cdn77.net/wp-content/uploads/2013/10/ssh4.png)
图解 4
现在关闭文件并保存它. 现在它已经准备好可以运行了.
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via: http://www.unixmen.com/use-python-ssh-machine/
本文由 [LCTT][] 原创翻译，[Linux中国][] 荣誉推出
译者：[flsf][] 校对：[校对者ID][]
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[1]:http://pexpect.sourceforge.net/pxssh.html