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To: python-list@python.org
From: Dennis Lee Bieber <wlfraed@ix.netcom.com>
Subject: Re: subprocess call is not waiting.
Date: Tue, 18 Sep 2012 15:20:59 -0400
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Xref: csiph.com comp.lang.python:29448

On Tue, 18 Sep 2012 14:54:41 +0100, andrea crotti
<andrea.crotti.0@gmail.com> declaimed the following in
gmane.comp.python.general:

> I have a similar problem, something which I've never quite understood
> about subprocess...
> Suppose I do this:
> 
> proc = subprocess.Popen(['ls', '-lR'], stdout=subprocess.PIPE,
> stderr=subprocess.PIPE)
> 
> now I created a process, which has a PID, but it's not running apparently...
> It only seems to run when I actually do the wait.
> 
> I don't want to make it waiting, so an easy solution is just to use a
> thread, but is there a way with subprocess?

	Unless you have a really massive result set from that "ls", that
command probably ran so fast that it is blocked waiting for someone to
read the PIPE.

-- 
	Wulfraed                 Dennis Lee Bieber         AF6VN
        wlfraed@ix.netcom.com    HTTP://wlfraed.home.netcom.com/