How to access environment variable values

Environment variables are accessed through os.environ

import osprint(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))

The Python default installation location on Windows is C:\Python. If you want to find out while running python you can do:

import sysprint(sys.prefix)

To check if the key exists (returns True or False)

'HOME' in os.environ

You can also use get() when printing the key; useful if you want to use a default.

print(os.environ.get('HOME', '/home/username/'))

where /home/username/ is the default

The original question (first part) was "how to check environment variables in Python."

Here's how to check if $FOO is set:

try:     os.environ["FOO"]except KeyError:    print "Please set the environment variable FOO"   sys.exit(1)