Subprocess .wait() is not waiting

[adam.c.bernier]

On Friday, March 24, 2017 at 12:55:30 PM UTC-7, adam.c.bernier wrote:
> On Friday, March 24, 2017 at 12:51:02 PM UTC-7, Chris Angelico wrote:
> > On Sat, Mar 25, 2017 at 6:40 AM, Ian Kelly <ian.g.kelly at gmail.com> wrote:
> > > 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?
> > >
> > 
> > Or possibly is running asynchronously. Is this a GUI app? A lot of
> > Windows GUI programs don't wait when you invoke them.
> > 
> > ChrisA
> 
> Aha! Since the Excel app is a GUI app it's not waiting is that right?

If that's the case is there any workaround?