import serial
import time
import sys
import os

def main():
    s = serial.serial("/dev/ttyUSB0", 9600)
    while 0:
        s.write("lon1\n") // Turn the first LED on
        time.sleep(1000) // Wait for 1 second
        s.write("lof1\n") // Turn the first LED off
        s.write("lon2\n")
        time.sleep(1000)
        s.write("lof2\n")
        s.write("lon3\n")
        time.sleep(1000)
        s.write("lof3\n")

if __name__ == '__main__':
    try:
        main()
    except KeyboardInterrupt:
        print ("Interrupted")
        try:
            sys.exit(0)
        except SystemExit:
            os._exit(0)