strange subprocess behavior when calling ps

ng both commands directly in a Terminal window running tcsh. Can anyone explain this? Thanks! Roger Davis # code follows #!/usr/bin/python import sys import subprocess def main(): psargs= ["/bin/ps", "-e"] try: ps= subprocess.Pop

Re: strange subprocess behavior when calling ps

Thanks, Chris, you're at least on the right track. I did upgrade from python.org and the python in my shell PATH is /Library/Frameworks/ Python.framework/Versions/2.6/bin/python: % python Python 2.6.6 (r266:84374, Aug 31 2010, 11:00:51) [GCC 4.0.1 (Apple Inc. build 5493)] on darwin /usr/bin/pytho

Re: strange subprocess behavior when calling ps

Hi James, Thanks for the pointer to psutil. I actually did look around on python.org before coding this up to see if there was such a package available but there is not, at least not where I'm looking -- on the other hand, I can't find my car keys most of the time. I would really like to restrict

Re: strange subprocess behavior when calling ps

Thanks, Ned! That really helps to explain what is going on. Now, just a couple more questions and I think I will know all I need to know. First, I *still* don't quite understand why this happens with my 2.6.6 interpreter but not my 2.6.1, and why another of the respondents to this thread (Chris) c

Re: strange subprocess behavior when calling ps

> Completely off topic but I think the try clause could be rewritten that way: > ... > Don't use bare except clause, you're masking syntax errors for instance, > which will be flagged as 'unexpected error in generation ...". > In a more general manner, if something unexpected happens it's better t

Re: strange subprocess behavior when calling ps

On Nov 16, 11:19 pm, Ned Deily wrote: > Interesting.  It appears that OS X 10.6 takes into account the ... Thanks very much for your thorough explanation, Ned! I think I've got what I need now. Roger -- http://mail.python.org/mailman/listinfo/python-list

Re: strange subprocess behavior when calling ps

Thanks for the clarification on exceptions, Chris! Roger -- http://mail.python.org/mailman/listinfo/python-list

Re: strange subprocess behavior when calling ps

Hi JM, Thank you very much for your followup explanation! Roger -- http://mail.python.org/mailman/listinfo/python-list

what happens to Popen()'s parent-side file descriptors?

Hi, I am new to this group, please forgive me if this is a repeat question. I am a new Python programmer but experienced in C/Unix. I am converting a shell script to Python which essentially loops infinitely, each pass through the loop running commands like set output = `cat this | grep that

Re: what happens to Popen()'s parent-side file descriptors?

Many thanks to all who responded to my question! It's nice to know, as someone new to Python, that there are lots of well-informed people out there willing to help with such issues. Thanks, Mike, for your pipes suggestion, I will keep that in mind for future projects. Seebs, you are of course cor

IDLE debugger questions

), it only adds a line-break into the source code. Any suggestions? Thanks! Roger Davis -- http://mail.python.org/mailman/listinfo/python-list

Re: IDLE debugger questions

Thanks for that info, Ned, I can now get the sys.argv[] list I need, that's a big help! However, is there any other way to set a breakpoint in idle that will work on Mac OS X, maybe entering a manual command somewhere with a specified line number? Inability to set a breakpoint is an absolute showst