execute commands independantly

[Mike Tammerman]

Hi,

I am trying to execute an executable or a pyton script inside my
program. I looked at the subprocess and os module. But all the
functions in these modules blocks my application. What I want to do is
run the subprocess without any concern. I don't care of its return type
or child signals. Just start and let it run independantly.

Thanks,
Mike

[Leif K-Brooks]

Re: execute commands independantly

Mike Tammerman wrote:[color=blue]
> Hi,
>
> I am trying to execute an executable or a pyton script inside my
> program. I looked at the subprocess and os module. But all the
> functions in these modules blocks my application.[/color]

subprocess doesn't block unless you call .wait():

from subprocess import Popen
proc = Popen('sleep 2; echo "Hello, world!"', shell=True)
print "In two seconds, something will happen."
proc.wait()
print "Did you see that?"

[Rune Strand]

Re: execute commands independantly


Mike Tammerman wrote:[color=blue]
> I am trying to execute an executable or a pyton script inside my
> program. I looked at the subprocess and os module. But all the
> functions in these modules blocks my application. What I want to do is
> run the subprocess without any concern. I don't care of its return type
> or child signals. Just start and let it run independantly.[/color]

If you don't need any output, os.system('app' ) should do.

[Eric McGraw]

Re: execute commands independantly


If you want it to return when the program is finished then use
os.system('app' ) but if you just want to start it and return right
away, use os.startfile('a pp')

[Mike Tammerman]

Re: execute commands independantly

You're right,

I tried subprocess.call and os.spawn* functions. Popen is what I will
be happy with.

Thanks a lot.

Mike

[Jorgen Grahn]

Re: execute commands independantly

On 6 Sep 2005 08:07:12 -0700, Eric McGraw <thelinuxmaster @gmail.com> wrote:[color=blue]
>
> If you want it to return when the program is finished then use
> os.system('app' ) but if you just want to start it and return right
> away, use os.startfile('a pp')[/color]

That one is Windows-only, though -- at least in 2.3 where I live. The
os.spawn* family of calls are more portable, but I'm not sure it's a good
idea to just spawn-and-forget a process.

/Jorgen

--
// Jorgen Grahn <jgrahn@ Ph'nglui mglw'nafh Cthulhu
\X/ algonet.se> R'lyeh wgah'nagl fhtagn!