Access environment variables from Python

Questions

I set an environment variable that I want to access in my Python application. How do I get this value?

Answers

http://docs.python.org/2/library/os.html#process-parameters http://docs.python.org/2/library/os.html#process-parameters

import os
print os.environ[ HOME ]

Or you can see a list of all the environment variables using:

os.environ

As sometimes you might need to see a complete list!

# using get will return `None` if a key is not present rather than raise a `KeyError`
print os.environ.get( KEY_THAT_MIGHT_EXIST )

# os.getenv is equivalent, and can also give a default value instead of `None`
print os.getenv( KEY_THAT_MIGHT_EXIST , default_value)

http://docs.python.org/install/index.html#how-installation-works http://docs.python.org/install/index.html#how-installation-works

import sys
print sys.prefix

Source

License : cc by-sa 3.0

http://stackoverflow.com/questions/4906977/access-environment-variables-from-python

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