steam-screensaver/steam_saver/__main__.py

import steam_saver
import sys
import os

SCRIPT_DIR = os.path.dirname(os.path.abspath(__file__))

if __name__ == '__main__':
    windowed_mode = False
    if len(sys.argv) > 0:
        for arg in sys.argv:
            if arg == '--window':
                windowed_mode = True

    steam_saver.main.main(windowed_mode)