guizero-gpiozero-polling.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 update_button():
    if button.is_pressed:
        message.value = "Button is pressed"
    else:
        message.value = "Button is not pressed"

# Update every 100ms, you might want to go faster.
text.repeat(100, update_button)
app.display()