ledTest.py

import RPi.GPIO as GPIO
from time import sleep

GPIO.setwarnings(False)
GPIO.setmode(GPIO.BOARD)
GPIO.setup(8, GPIO.OUT, initial=GPIO.LOW)

run = 1

while run == 1:
    mode = input("On, Off, or Exit?: ")
    if mode == "On":
        GPIO.output(8, GPIO.HIGH)
    elif mode == "Off":
        GPIO.output(8, GPIO.LOW)
    elif mode == "Exit":
        run = 0
    else:
        print("Please type On, Off, or Exit")
print("Goodbye!")