On Saturday, September 7, 2013 5:19:25 AM UTC-6, Peter Otten wrote: > larry.mart...@gmail.com wrote: > > > > > I have a python script and when I run it directly from the command line it > > > runs to completion. But I need to run it from another script. I do that > > > like this: > > > > > > p = subprocess.Popen(cmd, stdout=subprocess.PIPE, > > > stderr=subprocess.STDOUT) rv = p.wait() > > > out_buf = p.stdout.read() > > > > > > When I do this, wait never returns. If I trace the underlying script it's > > > always in the same write to stderr that never seems to complete: > > > > > > write(2, "/KA22/05Feb12/Images/12063LBO003"..., 24457 > > > > > > I run many other scripts and commands in the same manner, and they all > > > complete, it's just this one. Anyone have any ideas why this is happening, > > > and how I can further debug or fix this? > > > > The script writes to an OS buffer, and when that buffer is full it blocks > > forever. p.wait() in turn then waits forever for the script to terminate... > > > > As a fix try > > > > out_buf = subprocess.Popen(...).communicate()[0] > > > > > > This uses threads or select (depending on the OS) to avoid the problem -- > > and is prominently mentionend in the documentation: > > > > http://docs.python.org/2/library/subprocess.html#subprocess.Popen.wait
Thanks. I hadn't seen this. I'll check it out. -- https://mail.python.org/mailman/listinfo/python-list
