Display an info box on <return> or button click in guizero

from guizero import App, TextBox, PushButton, Text, info

# this function handles the when_key_pressed event
def key_press_event(event):
    # check if the <return> key was pressed
    if (event.key == "\r"):
        # you can do anything here - such as get or set values in a widget or call another function
        btn_go_clicked()

# this function displays an info box with a greeting message
def btn_go_clicked():
    info("Greetings","Hello, " + txt_name.value + " - I hope you're having a nice day")

# create a new app
app = App(title="Display an info box on <return> or button click")

# set the event handler function for the when_key_pressed event
app.when_key_pressed = key_press_event

# define the GUI widgets
lbl_name = Text(app, text="Hello. What's your name?")
txt_name = TextBox(app)
btn_go = PushButton(app, command=btn_go_clicked, text="Done")

# show the GUI on the screen
app.display()