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

On Fri, May 29, 2009 at 3:27 PM, shawn bright 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:
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

thanks

sk
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output = commands.getoutput("ls -lah")
Vince

On Fri, May 29, 2009 at 5:09 PM, Alan Gauld wrote:

"vince spicer" <vinces1979 at gmail.com> wrote
There are many ways to do this in Python including os.popen, commands and
subprocess.

But subprocess is the "officially correct" version, the others are
deprecated and could theoretically disappear in a future version of Python.
(But not soon I suspect because of the amount of legacy code that uses it!)

But its definitely worth weaning oneself onto subprocess even though it is
initially harder work. In the end the superior flexibility and consistency
of approach pay back.

Alan G.


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On Fri, May 29, 2009 at 4:27 PM, shawn bright 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:
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

On Fri, May 29, 2009 at 4:39 PM, W W wrote:
use subprocess module:

import subprocess

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

for line in op.stdout:
??? print line


HTH,
Wayne