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

 GPIO.setmode(GPIO.BCM)

 GPIO.setup(23, GPIO.IN, pull_up_down=GPIO.PUD_UP)
 GPIO.setup(22, GPIO.IN, pull_up_down=GPIO.PUD_UP)
 GPIO.setup(27, GPIO.IN, pull_up_down=GPIO.PUD_UP)
 GPIO.setup(18, GPIO.IN, pull_up_down=GPIO.PUD_UP)
 while True:
     if not(GPIO.input(23)):
         print("23 gedrueckt!")
     if not(GPIO.input(22)):
         print("22 gedrueckt!")
     if not(GPIO.input(27)):
         print("21 gedrueckt!")
     if not(GPIO.input(18)):
         print("18 gedrueckt!")