Activating Batch Files from Python

[Ben C]

On 2006-04-19, Jeff Groves <mikelemmer6 at yahoo.com> wrote:
> I'm writing a launcher that should do the following:
>
> 1. Activate a .bat file to set environmental variables.
> 2. Start 3 programs, using said environmental variables as arguments.
>
> However, I can't get the environmental variables to stick because all
> of Pythons' system start/open functions split off into their own little
> subshells, therefore the .bat file doesn't affect the main shell.
>
> How can I use the .bat file to set environmental vars from Python?

You can try launching a single shell with subprocess.Popen, and run
everything inside that:

from subprocess import *

p = Popen("cmd", stdin = PIPE, stdout = PIPE)

output, err = p.communicate("""
vars.bat
prog1.exe
prog2.exe
prog3.exe
""")

print output

I can't test this because I don't have a Windows system.

Otherwise, as others have suggested, replace vars.bat with modifications
to os.environ.