Adjusts the brightness of the laptop display

bright.py

#!/usr/bin/env python

import argparse

from fractions import Fraction

MAX_BRIGHTNESS_FILE = '/sys/class/backlight/intel_backlight/max_brightness'
BRIGHTNESS_FILE = '/sys/class/backlight/intel_backlight/brightness'

if __name__ == '__main__':
    parser = argparse.ArgumentParser(description='Adjusts the brightness of the laptop display.')
    parser.add_argument('level', type=int, help='Level of brightness from 1 to 10.')
    args = parser.parse_args()

    with open(MAX_BRIGHTNESS_FILE, 'r') as f:
        max_brightness = Fraction(f.read().strip())

    brightness_inc = max_brightness / 10
    level = min(max(args.level, 0), 10)
    brightness = str(int(brightness_inc * level))

    with open(BRIGHTNESS_FILE, 'w') as f:
        f.write(brightness)

usage: bright [-h] level

Adjusts the brightness of the laptop display.

positional arguments:
  level       Level of brightness from 1 to 10.

optional arguments:
  -h, --help  show this help message and exit