Activate RPI's fan based on its temperature, and define certain off hours

raspberrypi_fan.py

import RPi.GPIO as GPIO
import subprocess
import datetime
import time

SLEEPING_PERIOD=(21, 7)
MAX_TEMP=50

GPIO.setmode(GPIO.BOARD)
GPIO.setup(8, GPIO.OUT)

def start_fan():
    GPIO.output(8, GPIO.HIGH)

def stop_fan():
    GPIO.output(8, GPIO.LOW)

def get_temp():
    out = subprocess.check_output(["vcgencmd", "measure_temp"])
    return float(out.decode().split("=")[1].split("'")[0])

while True:
    try:
        if get_temp() >= MAX_TEMP and (datetime.datetime.now().hour >= SLEEPING_PERIOD[1] and datetime.datetime.now().hour <= SLEEPING_PERIOD[0]):
            start_fan()
        else:
            stop_fan()
        time.sleep(30)
    except KeyboardInterrupt:
        stop_fan()
        GPIO.cleanup()
        print("Bye!")
        break