Importing creating an environment variable in Python?

Question

This could be a silly question. I have code that calls a subprocess in Python. For it to work and find the program I will need to set an environment variable on my Mac TEST__LIB_PATH.

subprocess.call(["find_info",
                          image,
                          json_file])

Is there a way in Python I can just import this environment variable to use instead of having to set this up globally?

chepner · Accepted Answer · 2014-08-08 14:04:42Z

2

call takes a keyword argument env that takes a mapping to use as the environment for the command. The current environment is in os.environ; you can extend that with something like

subprocess.call(["find_info", image, json_file],
                env=dict(TEST__LIB_PATH="/path/requried/for/test", 
                         **os.environ))

answered Aug 8, 2014 at 14:04

chepner

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Stephan · Accepted Answer · 2014-08-08 14:00:27Z

1

You can access environment variables with os.environ:

import os
print(os.environ['TEST__LIB_PATH'])

os.environ also has a get() method:

os.environ.get('TEST__LIB_PATH')

Edit: here's a link to the docs

answered Aug 8, 2014 at 14:00

Stephan

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