Python 3 read and set environmental variable   

If you want to read, set and modify environmental variables with python you can do it by:

• reading

import os
myenv = os.environ['MYENV']

• reading with method

import os
os.environ.get('MYENV')

• reading with default

import os
os.environ.get('MYENV', 'None')

• setting/modifying

import os
os.environ["MYENV"] = "MyValue"

• setting/modifying integer value

import os
os.environ["MYENV"] = "12"