calling bash configuration files in python script to setup environmental variables [duplicate]

Question

I have a text file contains all the paths belong to bunch of commands that can be called in the bash scrpits and it is called progs.ini. Usually when I want to call this configuration file in my bash script I use this command

. progs.ini

progs.ini contains stuff for instance like this:

BIN=/bin/linux_64/
P_ANALYSE=${BIN}/analyse
NPARA=1

now I want to use some part of my code in python and I was trying to use this command as following:

import subprocess as S
import os
CMD='. progs.ini'
S.call([CMD],shell=True)

It doesn't return any error message but it can not recognise the variables which are defined in progs.ini

>>os.system('echo ${BIN}')

0

Well it is not about setting some environmental variable which is similar to this problem. I want to set some variables using the configuration file.

The shell processes run by subprocess and os.system are unrelated. They do not share any state. — Etan Reisner
– Etan Reisner, Commented Jul 15, 2015 at 13:20
No. I meant the are unrelated to each other. You have effectively just run bash -c '. progs.ini'; bash -c 'echo $BIN' and wondered why the variable didn't work. Those two commands don't share any state. They don't share variables, etc. They are entirely different processes. — Etan Reisner
– Etan Reisner, Commented Jul 15, 2015 at 13:23
@EtanReisner Is there any way that I can set these variables which are a huge pile of them in my python script without re-writting them? — Dalek
– Dalek, Commented Jul 15, 2015 at 13:30

Max Murphy · Accepted Answer · 2015-07-15 13:49:39Z

2

You seem to be using Linux. In that case I would be inclined to put a cat /proc/$$/environ at the end of your ini file. That will print out all the key value pairs in a format that's easy to parse. This should do:

s = os.popen(". whatever.ini && cat /proc/$$/environ").read()
env_vars = {x[:x.find("=")]:x[x.find("=")+1:] for x in s.split("\00")[:-1]}

Tested. That didn't work but this did:

s = os.popen(". ./whatever.ini && set").read()
env_vars = {x[:x.find("=")]:x[x.find("=")+2:-1] for x in s.split("\n")[:-1]}
print env_vars['hello']

edited Jul 15, 2015 at 13:49

answered Jul 15, 2015 at 13:40

Max Murphy

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