On Tue, Nov 16, 2010 at 6:33 PM, Roger Davis <r...@hawaii.edu> wrote: > Hi all, > > I have encountered a strange problem with some code I am writing to > search the system process list for certain running processes. I am > using subprocess.Popen() to call '/bin/ps -e'. When I save my code to > the file pid.py (whose first line is #!/usr/bin/python) and run it > with the command > > % ./pid.py > > it works perfectly fine, retrieving lines from my pipe to the /bin/ps > output which look exactly as if I had typed the command '/bin/ps -e' > myself into a shell window. Here is a sample line from that output: > > 1891 ttys000 0:00.12 -tcsh > > Now for the weird part -- when I run this code using the command > > % python pid.py > > I get entirely different output. It only prints out a very few > processes instead of the entire table, and each line also has lots of > environment variable values displayed. <snip> > It's like it's calling up an entirely different ps, or passing it > different command arguments. In both cases, however, I am explicitly > calling /bin/ps with the same -e argument, and there appear to be no > other ps commands on my system, neither do I appear to have any ps > builtin command in any shell. > > I am running 2.6.6 under MacOS 10.6.4 on a MacBook Pro Intel. I have > appended the code below. I am running both commands directly in a > Terminal window running tcsh. > > Can anyone explain this? Thanks! <snip> > ##### code follows > > #!/usr/bin/python <snip>
Have you checked whether those commands are running under the same Python? What output do you get from tcsh for the following?: which python python -V /usr/bin/python -V ls -l /usr/bin/python Also, did you upgrade your system Python or something? I'm running Mac OS 10.6.5 and the built-in /usr/bin/python is v2.6.1, so I find the implied claim that your /usr/bin/python is v2.6.6 to be rather bizarre. I am unable to reproduce your problem with either my v2.6.1 system Python or my v2.6.6 Python from Fink. Cheers, Chris -- http://blog.rebertia.com -- http://mail.python.org/mailman/listinfo/python-list
