import os  # Set environment variables os.environ['API_USER'] = 'username' os.environ['API_PASSWORD'] = 'secret'  # Get environment variables USER = os.getenv('API_USER') PASSWORD = os.environ.get('API_PASSWORD')  # Getting non-existent keys FOO = os.getenv('FOO') # None BAR = os.environ.get('BAR') # None BAZ = os.environ['BAZ'] # KeyError: key does not exist. 

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