If you want to get and set environment variables using Python, simply use the relevant methods from os. To set an environment variable, do this:

import os

os.environ['SOME_ENV_VARIABLE'] = 13.5

And to access an environment variable, there are actually a number of different ways. All these three are essentially the same:

os.getenv('SOME_ENV_VARIABLE')
os.environ.get('SOME_ENV_VARIABLE')
os.environ('SOME_ENV_VARIABLE')

For the final one (os.environ('SOME_ENV_VARIABLE')), if the variable doesn’t exist, it’ll return a KeyError, whereas the first two will just return None in that case.