door.py

import time
import RPi.GPIO as io
io.setmode(io.BCM)
     
door_pin = 12
light_pin = 16
printed = 0
loop = 1
    
io.setup(door_pin, io.IN, pull_up_down=io.PUD_UP) # activate input with PullUp
io.setup(light_pin,io.OUT)
io.output(light_pin, io.LOW)

while loop:
	
	if io.input(door_pin):
		print("...open...")
		io.output(light_pin, io.HIGH)
else:
		print("CLOSED")
		io.output(light_pin, io.LOW)

    	    
    	    	    
	time.sleep(0.5)