Launch python script with command line arguments -

i'd execute script, passing arguments command line:

import serial import sys  try:   ser = serial.serial("com7", 9600) except serial.serialexception:   print("exception...")   if sys.argv[1] == "on":    ser.write("m".encode('latin1'))    print("light on...") elif sys.argv[1] == "off":    ser.write("n".encode('latin1'))    print("light off...")  ser.close() 

the serial device doesn't character sent through serial communication if script launched command line:

c:\users\user\desktop\seriale.py on 

launching through python idle (removing sys.argv sure) works , serial device gets data should. wrong?