Can you bind two functions to button.when_pressed in python gpiozero?

Question

I am trying to bind two functions to a button, so for example I want to toggle a buzzer and LED with a single button. Is there a way to attach two functions to the same button or can a button only do a single thing at once?

For example:

button.when_pressed = led.toggle && buzzer.toggle

You can only bind one function - but that function can call as many other functions as it likes. — jasonharper, Dec 18 '21 at 20:41

score 3 · Answer 1 · answered Dec 18 '21 at 20:43

3

Bind to a function that calls both functions:

def toggle_led_and_buzzer():
    led.toggle()
    buzzer.toggle()

button.when_pressed = toggle_led_and_buzzer

answered Dec 18 '21 at 20:43

Barmar

741,623
53
500
612

Erling Olsen · Accepted Answer · 2021-12-18T21:58:49.433

You can use 2 solutions. Just merge the two functions into a single function, then call up that single function with the button, or alternatively using a lambda

SOLUTION N.1

def ledtoggle_buzzertoggle():
    led.toggle()
    buzzer.toggle()

button.when_pressed = ledtoggle_buzzertoggle

SOLUTION N.2

You can also use lambda

button.when_pressed = lambda:[led.toggle(), buzzer.toggle()] #or without square brackets

Can you bind two functions to button.when_pressed in python gpiozero?

2 Answers2