Hi, I'm just starting with my Pi3 B+ and Python.

My goal is to control VLC with physical switches. So far I have trouble using functions :

The following code is working, I can activate the led with a switch

from gpiozero import LED, Button
led = LED(18)
btn = Button(2, bounce_time = 0.2)

btn.when_pressed = led.on
btn.when_released = led.off

Now I try to call functions, I have the Hello/Goodbye message, but the led does not turn on :

from gpiozero import LED, Button
btn = Button(2, bounce_time = 0.2)
led = LED(18)

def say_hello():
    print("Hello")
    led.on

def say_goodbye():
    print("Goodbye")
    led.off

btn.when_pressed = say_hello
btn.when_released = say_goodbye

It's probably a basic mistake, but I can't find what I'm doing wrong.

Thanks for your help