Receiving Output from os.system command

K-Dawg kdawg44 at gmail.com
Mon Jan 19 20:21:12 CET 2009


Nevermind, I am an idiot.  I didn't realize what it was returning...

Please disregard.

Thanks.

Kevin


On Mon, Jan 19, 2009 at 2:14 PM, K-Dawg <kdawg44 at gmail.com> wrote:

> I am really new to python and am trying to learn it to do some projects.  I
> wanted to perform a simple task and am having some trouble with it.  I run
> linux in a vm on a windows laptop for work.  I have my laptop screen and an
> external monitor.  I move my Ubuntu VM back and forth depending on what I am
> working on so I wanted to write a little python script that changed the
> resolutions depending on what the current resolution is.
>
> I have:
>
> #! /usr/bin/python
>
> import sys
> import os
> import re
>
> re_currentResolution = re.compile(r'current \d{4}\sx\s\d{3,4}')
> xrandr_output = os.popen('xrandr').readlines()
> currentRes = re_currentResolution.search(xrandr_output)
> print currentRes.group(0)
>
> I just want to grab the xrandr output as a string and parse it with the
> regex.  This will give me a string with the current resolution, for instance
> "current 1024 x 768".  I would then split that up and call back to the
> os.system('xrandr -s 1280x1024').  If the resolution was "current 1280 x
> 1024" then I would parse that and call back to os.system('xrandr -s
> 1024x768').
>
> However, when I try the line (as in the code above):
>
> currentRes = re_currentResolution.search(xrandr_output)
>
> it is complaining that xrandr_output is not a string.  (however, if I do a
> print xrandr_output it prints fine)
>
> I instead get the following error:
>
> Traceback (most recent call last):
>   File "change_res.py", line 9, in <module>
>     currentRes = re_currentResolution.search(xrandr_output)
> TypeError: expected string or buffer
>
> What am I doing wrong?
>
> Thanks.
>
> Kevin
>
>
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