Simple script to print current power draw in Watts on Linux notebooks

current_power.py

import time

if __name__ == '__main__':
    while True:
        with open('/sys/class/power_supply/BAT0/current_now', 'r') as f:
            current = float(f.readline().strip())
        with open('/sys/class/power_supply/BAT0/voltage_now', 'r') as f:
            voltage = float(f.readline().strip())

        print(f'{current * voltage / 1000000000000} W', end='\r')

        time.sleep(1)