shell 命令标准输出事件在 Python

Question

I'm trying to watch wifi network changes from Python. So there is iwevent which is a part of wireless_tools on Linux to watch events. Every time I'm switching wifi, iwevent prints out following output

03:33:33.082474   wlan0    New Access Point/Cell address:Not-Associated
03:33:33.168659   wlan0    Scan request completed
03:33:33.234036   wlan0    Association Request IEs:00...
03:33:33.234109   wlan0    Association Response IEs:01...
03:33:33.234171   wlan0    New Access Point/Cell address:F...

So is there a way I can do this in an event driven way where Python watching stdout in a thread and when it gets new stdout it's doing to trigger a method?

Answer 1

Wich wireless tool are you using, can you tell?

Or, please, check if you could setting up a file to write log, instead to use sys.stdout . I think you can configure it by params (even using *args or **kwargs )

OR If ou have access to the code (of the your wireless-tools), you can easily do it by:

sys.stdout = open("/path/MyFileStdout.log", "w")

And every print in your program will be written to the file, and you can monitoring the file easily, using python-watchdog library, a straightforward Python API library to monitor file system events, like these examples:

1. https://blog.magrathealabs.com/filesystem-events-monitoring-with-python-9f5329b651c3
2. http://timgolden.me.uk/python/win32_how_do_i/watch_directory_for_changes.html

I hope this can help you, or, please, give us more information about your environment.

Best wishes!