Help with 'popen'

[stephen_b]

Can someone let me know why this won't work? Thanks.
'\n'

Thanks.

Stephen

 

[James Stroud]

Can someone let me know why this won't work? Thanks.



'\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()
'hello\n'

James

 

[Tim Roberts]

Can someone let me know why this won't work? Thanks.

'\n'

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()
'hello\n'

For completeness, let us anticipate the followup question and point out
that "permanent" here means "for this process and any processes that it
spawns". Once the Python session ends, the "asdfasdf" will be lost.