Fairytale Phone

phone.py

#!/usr/bin/python
import RPi.GPIO as GPIO  

GPIO.setwarnings(False)
GPIO.setmode(GPIO.BCM)  
GPIO.setup(18, GPIO.IN, pull_up_down=GPIO.PUD_UP)
GPIO.setup(23, GPIO.IN, pull_up_down=GPIO.PUD_UP)

c = 0
last = 1

def count(pin):
    global c 
    c = c + 1

GPIO.add_event_detect(18, GPIO.BOTH)

while True:
    try:
        if GPIO.event_detected(18):
            current = GPIO.input(18)
            if last != current:
                if not current:
                    GPIO.add_event_detect(23, GPIO.BOTH, callback=count, bouncetime=5)
                else:
                    GPIO.remove_event_detect(23)
                    number = c // 2
                    c = 0
                last = GPIO.input(18)
    except KeyboardInterrupt:
        break