如何在python中执行ping或traceroute，以访问产生的输出?

问题描述

之前，我问了这个问题:

Earlier, I asked this question:

如何执行ping或使用本机python进行traceroute?

但是，由于python不是以root身份运行，因此它无法打开在本地python中执行ping/traceroute所需的原始ICMP套接字.

However because python is not running as root it doens't have the ability to open the raw ICMP sockets needed to perform the ping/traceroute in native python.

这使我重新使用系统的ping/traceroute shell命令.这个问题有几个使用subprocess模块的示例，它们似乎运行良好:

This brings me back to using the system's ping/traceroute shell commands. This question has a couple examples using the subprocess module which seem to work well:

用Python ping网站?

不过，我还有一个要求:我需要能够访问产生的输出(例如，用于长时间运行的traceroute).

I still have one more requirement though: I need to be able to access the output as it is produced (eg. for a long running traceroute.)

以上所有示例都运行shell命令，然后仅在命令完成后才使您可以访问完整的输出.有没有办法在产生命令输出时对其进行访问?

The examples above all run the shell command and then only give you access to the complete output once the command has completed. Is there a way to access the command output as it is produced?

编辑:根据Alex Martelli的回答，这是可行的方法:

Based on Alex Martelli's answer, here's what worked:

import pexpect

child = pexpect.spawn('ping -c 5 www.google.com')

while 1:
        line = child.readline()
        if not line: break
        print line,

推荐答案

pexpect 是我的意思默认情况下"可以满足您的任何需求-还有其他类似的模块，但是pexpect几乎总是最丰富，最稳定和最成熟的模块.我要寻找替代方法的一种情况是，如果我也必须在Windows下正确运行(无论如何ping和traceroute可能都有其自身的问题)，请告诉我们是否适合您，我们将看看可以安排什么！-)

pexpect is what I'd reach for, "by default", for any requirement such as yours -- there are other similar modules, but pexpect is almost invariably the richest, most stable, and most mature one. The one case where I'd bother looking for alternatives would be if I had to run correctly under Windows too (where ping and traceroute may have their own problems anyway) -- let us know if that's the case for you, and we'll see what can be arranged!-)

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