raspberry pi led blink

piblink.py

import RPi.GPIO as GPIO
import time

# to use Raspberry Pi board pin numbers
GPIO.setmode(GPIO.BOARD)

# set up GPIO output channel
GPIO.setup(26, GPIO.OUT)

while 1:
  # set RPi board pin 26 high
  GPIO.output(26, True)
  time.sleep(.5)
  GPIO.output(26, False)
  time.sleep(.5)