[Tutor] how to get variable from an external script or program

W W srilyk at gmail.com
Fri May 29 23:39:23 CEST 2009

On Fri, May 29, 2009 at 4:27 PM, shawn bright <nephish at gmail.com> wrote:

> Hey all
> I have a small program that when run from the command line, will
> return a certain value for an arguement. Like this:
> > mfetchz 45
> > 45j
> so the program is mfetchz and the argument is 45
> i know i can call the program with os.system("mfetchz 45")
> but how do i get the return?
> The OS is linux, if that matters

use subprocess module:

import subprocess

op = subprocess.Popen(['mfetchz', '45'], stdout=subprocess.PIPE)

for line in op.stdout:
    print line

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