passing command line arguments to executable

[mcanjo]

On Apr 3, 11:15 am, Patrick Maupin <pmau... at gmail.com> wrote:
> On Apr 3, 11:09 am, mcanjo <mca... at gmail.com> wrote:
>
> > I have an executable (I don't have access to the source code) that
> > processes some data. I double click on the icon and a Command prompt
> > window pops up. The program asks me for the input file, I hit enter,
> > and then it asks me for and output filename, I hit enter a second time
> > and it goes off and does its thing and when it is finished running the
> > Command Prompt goes away and I have my new output file in the same
> > directory as my executable and input file. I would like to be able to
> > batch process a group of files. I thought about using "os.spawnv()" in
> > a loop and at each iteration of the loop passing in the file in and
> > out names but that didn't work. Does anyone have any ideas?
>
> You need to look at the subprocess module, and use pipes.
>
> Regards,
> Pat


I tried doing the following code:

from subprocess import Popen
from subprocess import PIPE, STDOUT
exefile = Popen('pmm.exe', stdout = PIPE, stdin = PIPE, stderr =
STDOUT)
exefile.communicate('MarchScreen.pmm\nMarchScreen.out')[0]

and the Command Prompt opened and closed, no exceptions were generated
but the program didn't run. Am I doing something wrong?