First install selenium from pip

pip install selenium

Then add a webkit for your preffered browser.Here chrome is being used but you can change in the roulette.py.

#For Chrome
driver = webdriver.Chrome(PATH)

#For Firefox
driver = webdriver.Firefox(PATH)

Add a .env file with your the following info

STEAM_USERNAME="yourUsername"
STEAM_PASSWORD="yourPassword"
WEBKIT_PATH = "Absoulute/Path/to/webkit"