Match the brightness level on all connected displays.

bright.py

"""
Match the brightness level on all connected displays.
Usage: bright.py 50

Requires https://pypi.org/project/screen-brightness-control/
"""

import sys
import screen_brightness_control as sbc

def usage():
    print("Usage: bright.py [0..100]")

if __name__ == "__main__":
    if len(sys.argv) > 1 and (int(sys.argv[1]) > 1 and int(sys.argv[1]) <= 100):
        print(f"Setting brightness to {sys.argv[1]}")
        for display in sbc.list_monitors():
            sbc.set_brightness(int(sys.argv[1]), display=display)
    else:
        usage()
        for display in sbc.list_monitors():
            print(f"{display}: {sbc.get_brightness(display)[0]}")