Lights_Script.py

from datetime import datetime
import RPi.GPIO as GPIO

GPIO.setmode(GPIO.BCM)
GPIO.setup(17,GPIO.OUT)

def lights_on():
    """ Turn the lights on. """
    GPIO.output(17,GPIO.LOW)

def lights_off():
    """ Turn the lights off. """
    GPIO.output(17,GPIO.HIGH)

if __name__ == "__main__":
    hour = datetime.now().hour

    if hour >= 9 and hour < 21:
        lights_on()
    else:
        lights_off()