import RPI.GPIO as GPIO
import time 
£setup GPIO mode
GPIO.set mode(GPIUO0,BCM)
GPIO.setup?(IT,GPIO.OUT)
try:
    while true :
        GPIO.output (IT,GPIO,HIGH)
        time.sleep(1)
        GPIO.output(IT,GPIO,LOW)
        time.sleep(1)
 Except keyboard intrnet
         GPIO cleanup()