Simple RPi toggle switch

toggle.py

import RPi.GPIO as GPIO
GPIO.setmode(GPIO.BCM)

push_button = 17
led = 22

GPIO.setup(push_button, GPIO.IN, pull_up_down=GPIO.PUD_DOWN)
GPIO.setup(led, GPIO.OUT)

last = False
def notify(channel):
  global last
  print "Notify!"
  print channel
  if last == False:
    GPIO.output(led, False)
    last = True
  else:
    GPIO.output(led, True)
    last = False
    
GPIO.add_event_detect(push_button, GPIO.FALLING, callback=notify, bouncetime=200)
raw_input("Push key to exit")
GPIO.cleanup()