screen_py_version

#!/usr/bin/python3

# os for executing command and sys for geting argumant ('up' or 'down')
import sys, os

def run():
    stream = os.popen('xrandr --prop --verbose | grep -A10 " connected" | grep "Brightness"')
    dev = os.popen('xrandr --prop --verbose | grep -A10 " connected primary"').read().split()[0]
    b = float(stream.read().split()[1])
    # now we have current brightness as a float var in b
    check = sys.argv[1]
    if check == 'up' and b < 1.0:
        b += 0.1
        os.system(f'xrandr --output {dev} --brightness {b}')
        # changing brightness
    elif check == 'down' and b > 0.1:
        b -= 0.1
        os.system(f'xrandr --output {dev} --brightness {b}')

    os.system('notify-send "Screen Brightness: {:.0f}%"'.format((b / 1) * 100))
    # showing the changed value brightness to user

if __name__ == '__main__':
    check_for_xrandr = os.popen('which xrandr').read()
    if check_for_xrandr != '':
        run()
    else:
        os.system('notify-send "You don\'t have xrandr, install by: \n[apt/dnf] install xrandr\npacman -Sy xrandr"')