new_contents: # A simple Python program to check to see if a button attached
  # to GPIO 18 and if it is, print that it was pressed.
  # Taken from http://razzpisampler.oreilly.com/ch03.html#SEC7.1
  
  import RPi.GPIO as GPIO
  import time
  
  GPIO.setmode(GPIO.BCM)
  GPIO.setup(18, GPIO.OUT)
  
  while (True):
      GPIO.output(18, True)
      time.sleep(0.5)
          GPIO.output(18, False)
          time.sleep(0.5)
  
subject: Create led_blink.py