import RPi.GPIO as GPIO
from time import sleep

GPIO.setmode (GPIO.BOARD)
GPIO.setup (11, GPIO.OUT)
while True:
    GPIO.output(11, True)
    sleep (2)
    GPIO.output(11,False)
    sleep (1)
    GPIO.output(11, True)
    sleep (2)
    GPIO.output(11,False)
    sleep (1)
    GPIO.output(11, True)
    sleep (2)
    GPIO.output(11,False)
    sleep (1)
    GPIO.output(11, True)
    sleep (0.5)
    GPIO.output(11,False)
    sleep (1)
    GPIO.output(11, True)
    sleep (0.5)
    GPIO.output(11,False)
    sleep (1)
    GPIO.output(11, True)
    sleep (0.5)
    GPIO.output(11,False)
    sleep (1)
    GPIO.output(11, True)
    sleep (2)
    GPIO.output(11,False)
    sleep (1)
    GPIO.output(11, True)
    sleep (2)
    GPIO.output(11,False)
    sleep (1)
    GPIO.output(11, True)
    sleep (2)
    GPIO.output(11,False)
    sleep (4)

Create SOS.py