digipi/home/pi/gpio_redled.py

#!/usr/bin/python3

import pyinotify
#import RPi.GPIO as GPIO
from gpiozero import LED
import os.path
from time import sleep

#GPIO.setwarnings(False)

def handle_change(cb):
   with open('/sys/class/gpio/gpio12/value', 'r') as f:
      status = f.read(1)
      if status == '0':
         #print("OFF\n")
         led26.off()
      else:
         #print("RED!\n")
         led26.on()
   f.close

def null_function(junk):  # default callback prints tons of debugging info
   return()

# wait for something to initialize PTT gpio pin
while not os.path.exists("/sys/class/gpio/gpio12/value"): 
   sleep(5)

print("Detected GPIO12 initialization.  Mirroring state to GPIO26.")

led26 = LED(26)
led12 = LED(12)

# Instanciate a new WatchManager (will be used to store watches).
wm = pyinotify.WatchManager()

# Associate this WatchManager with a Notifier 
notifier = pyinotify.Notifier(wm, default_proc_fun=null_function)

# Add a new watch 
wm.add_watch('/sys/class/gpio/gpio12/value', pyinotify.IN_MODIFY)

# Loop forever and handle events.
notifier.loop(callback=handle_change)