Subprocess .wait() is not waiting

Ian Kelly ian.g.kelly at
Fri Mar 24 15:40:15 EDT 2017

On Fri, Mar 24, 2017 at 12:42 PM, adam.c.bernier <adam.c.bernier at> wrote:
> Hi,
> I am on Windows 7. Python 2.7
> I'm trying to have a program run another program using `subprocess.Popen`
>     import subprocess as sp
>     args = shlex.split(args)
>     proc = sp.Popen(args,stdout=sp.PIPE,stderr=sp.PIPE)
>     out, err = proc.communicate()
>     proc.wait()
> But it *sometimes* doesn't wait and the other program -- which generates a set of 14 Excel files -- does not complete before control is returned to the calling program.
> Any ideas on what I can do to make `subprocess.wait()` actually wait?
> Thanks in advance for any assistance you might be able to provide.

If that's what's happening it would be a bug. Are you sure that the
other program isn't simply crashing or otherwise failing to complete?

By the way, the wait in the code above is redundant because
communicate already waits.

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