Setting environment environment variables with a Python script

Question

OS: Mac OSX 10.14 Python 2.7

I have a python script which looks like below:

#! /usr/bin/python

import os

os.system('./binaryfileproducesenv_variables > ./env_variables_file')
os.system('chmod 744 ./env_variables_file')
os.system('./env_variables_file')

os.system('python anotherpythonscript.py')

The env_variables_file looks like this:

passwordA='abcd';
passwordB='1234';
export passwordA passwordB

The anotherpythonscript.py will only work properly if the environment variables above are set properly. When i run it via the main python script it does not define the variables. Although, if i run the ./env_variables_file directly from the command line it will set the environment variables. Any suggestions how to run this through the Python script and have it set the environment variables.

os.system('python anotherpythonscript.py') - why do you do this? Why don't you just import it as a module and run the main function (if it was designed to run as script and has if __name__="__main__": main())? — h4z3
– h4z3, Commented Dec 11, 2019 at 17:18
stackoverflow.com/questions/5971312/… I think this answers your question — polololya
– polololya, Commented Dec 11, 2019 at 17:18
I was looking at using os.environment, but the env_variables_file is a newly created file that needs to be created everytime (with new environemnts passwords) we want to run the anotherpythonscript.py script — aznjonn
– aznjonn, Commented Dec 11, 2019 at 17:22
if you use only os.system in python script then you should rather create bash script. You will have the same command but without os.system — furas
– furas, Commented Dec 11, 2019 at 18:13
os.system('./env_variables_file') doesn't do what you think it does. Running a script sets the export in the one subshell. You need to read the file, and set each variable individually using os.environ before calling the next script. That said: just make a bash wrapper instead of a python one, reducing complexity and execution time. — tink
– tink, Commented Dec 11, 2019 at 18:26

tink · Accepted Answer · 2019-12-11 18:27:22Z

1

See comment above:

#!/usr/bin/env bash
./binaryfileproducesenv_variables > ./env_variables_file
. ./env_variables_file
python anotherpythonscript.py

answered Dec 11, 2019 at 18:27

tink

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1 Comment

aznjonn Over a year ago

I wanted to stick to python but yeah a simple bash script is the way and makes more sense

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