Modifying operating system environment variables from Python

Question

I'm using Tesseract OCR and everytime I run a new session it asks for setting the TESSDATA_PREFIX variable, I do so by running the command export TESSDATA_PREFIX="PATH_TO_FILES" How can I do it inside the python script i'm running ?
Thanks !

it depends on how you run the session. Do you use subprocess? — frans
– frans, Commented Feb 2, 2014 at 11:25
Why, does import os; os.environ['TESSDATA_PREFIX'] = "PATH_TO_FILES" not work for you? — Nehal J Wani
– Nehal J Wani, Commented Feb 2, 2014 at 11:25

Mikko Ohtamaa · Accepted Answer · 2014-02-02 11:25:18Z

1

You can do:

 import os
 os.putenv("TESSDATA_PREFIX", "PATH_TO_FILES")

More info

http://docs.python.org/2/library/os.html#os.putenv

answered Feb 2, 2014 at 11:25

Mikko Ohtamaa

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Marcin Barylski · Accepted Answer · 2014-02-02 11:29:56Z

1

Please try adding to your python:

import os
os.environ["TESSDATA_PREFIX"] = "PATH_TO_FILES"

answered Feb 2, 2014 at 11:29

Marcin Barylski

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Mr. Girgitt · Accepted Answer · 2014-02-02 11:37:12Z

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You could try using os module to set environment variable:

setting:

os.environ['TESSDATA_PREFIX'] = "PATH_TO_FILES"

getting:

   pat_to_files = os.environ['TESSDATA_PREFIX']

Such variable will be accessible from the python code but it may not remain accessible for other programs when your python code quits.

If your goal is to set env variable for other program then you could try this recipe: http://code.activestate.com/recipes/159462-how-to-set-environment-variables/

answered Feb 2, 2014 at 11:37

Mr. Girgitt

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