off.py

import serial

ser = serial.Serial('/dev/ttyUSB0', 9600, 8, serial.PARITY_NONE, serial.STOPBITS_ONE)

print("turning tv off")
ser.write("801s!000\x0D")
print("reading reply")
response = ser.read(4)
print("%s" % response)

on.py

import serial

ser = serial.Serial('/dev/ttyUSB0', 9600, 8, serial.PARITY_NONE, serial.STOPBITS_ONE)

print("turning tv on")
ser.write("801s!001\x0D")
print("reading reply")
response = ser.read(4)
print("%s" % response)

status.py

import serial

ser = serial.Serial('/dev/ttyUSB0', 9600, 8, serial.PARITY_NONE, serial.STOPBITS_ONE)

print("checking tv status")
command = "801gl000\x0D"
print("command: %s" % command)
ser.write(command)
print("reading reply")
response = ser.read(1)
print("%s" % response)