flashing gutton timer

from guizero import App, PushButton, Text

def toggle_background_color():

    if button.bg == "black":
        button.bg = "white"
    else:
        button.bg = "black"




app = App()
button = PushButton(app,text = "one second")
button.bg = "black"

button.repeat(1000, toggle_background_color)

app.display()