guizero-gpiozero-event.py

from guizero import App, Text
from gpiozero import Button

button = Button(2)  
app = App(title="Hello GPIO")
message = Text(app, text="Waiting for first update")

def pressed_button():
    message.value = "Button is pressed"
    
def released_button():        
    message.value = "Button is not pressed"

# Add events
button.when_pressed = pressed_button
button.when_released = released_button

app.display()