I was searching for ways to get the return value from os.system()
calls, when I came across this from 6 years ago. I tried what was
suggested in this thread, but
output = os.popen("/tmp/other").read()
returns
sh: line 1: /tmp/other: Permission denied
I'm relatively new to Python, hardly ever use the shell and am
currently running Python 2.5.5 on Mac OS 10.4.10
Cameron Laird <claird at starbase.neosoft.com> wrote:
> In article <98795o$kq8$0 at 216.39.151.169>, Donn Cave <donn at
oz.net> wrote:
>>Quoth Damian Menscher <menscher+python at uiuc.edu>:
>>| I'm new to Python (as in, my experience is essentially the
tutorial),
>>| but I've already come up with an interesting question:
>>|
>>| How do I get the return code from an os.system call? I would have
>>| expected I could do something like
>>|
>>| ---returncode---
>>| #/bin/csh
>>| echo do stuff
>>| exit 3
>>|
>>| and then in my python program I could do
>>|
>>| print os.system('./returncode')
>>|
>>| But it prints out 768. Not particularly useful, even after I
recognize
>>| the trick of dividing by 256 (byte-swapping going on? No,
because a
>>| return code of 768 reports as 0). Given that my real return codes
>>| will be (possibly large) integers, this limitation will likely
cause
>>| some serious problems down the line.
>>|
>>| Even better would be a way of returning a string (the script I run
>>| can be something other than csh, but it has to be a separate
script).
>>|
>>| Ideas? I'm trying to avoid writing the string out to a file and
then
>>| read the file back in to the python program....
> Guys, guys; you are making it too hard on Mr. Menscher. My guess
> is that he'd appreciate being told that, if he creates /tmp/other
> with contents
> #!/bin/sh
> echo "This is a string from an external process."
> he can then have fun with
> import os
> print os.popen("/tmp/other").read()
Thank you much -- this solves my problem. I'm sure I'll have more
questions in the near future, though....
Damian Menscher
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