Help with 'popen'

James Stroud jstroud at
Mon Jan 22 06:59:08 CET 2007

stephen_b wrote:
> Can someone let me know why this won't work? Thanks.
>>>>from os import popen
>>>>popen('export asdfasdf=hello').read()
> ''
>>>>popen('echo $asdfasdf').read()
> '\n'
> Thanks.
> Stephen

Python starts a new shell for each command, so your environment variable 
is lost. You probably want this, which makes the variable "permanent".

py> import os
py> os.environ['asdfasdf'] = 'hello'
py> os.popen('echo $asdfasdf').read()


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