call shell from python

[Chris Rebert]

On Mon, Feb 11, 2013 at 9:13 PM, contro opinion <contropinion at gmail.com> wrote:
>>>> import os
>>>> os.system("i=3")
> 0
>>>> os.system("echo $i")
>
> 0
> how can i get the value of  i?

Your example is too heavily contrived for me to give a much more
specific/useful answer than "use the `subprocess` module":
http://docs.python.org/2/library/subprocess.html#using-the-subprocess-module

Of course, if all you want to do is manipulate environment variables,
then there's `os.environ`:
http://docs.python.org/2/library/os.html#os.environ

Good luck, my pseudonymous contrarian compadre.
– Chris