Raspberry Pi -Python GUI - Superhero Name Generator

# guizero - hero name generator
from guizero import App, Text, ButtonGroup, Combo, PushButton, TextBox, CheckBox
app = App(title="Create a Hero Name")

# Function definitions for your events go here.
def make_hero_name():
    adjective = cmb_adjective.value
    color = txt_color.value
    animal = cmb_animal.value
    hero = adjective + " " + color + " "+ animal
    lbl_output.value = "You are... The " + hero + "."
    if cb_prettify.value == 1:
        lbl_output.text_color = "purple"
    else:
        lbl_output.text_color = "black"

# Your GUI widgets go here
message1 = Text(app, text="Choose an adjective")
cmb_adjective = Combo(app, options=["Amazing", "Spectacular", "Incandescent", "Spooktacular", "Redonculus"], selected="Amazing")

message2 = Text(app, text="Choose a color")
txt_color = TextBox(app)

message3 = Text(app, text="Pick an animal")
cmb_animal = Combo(app, options=["Narwahl", "Jackalope", "Spider Monkey", "Poodle", "Crustacean"], selected="Crustacean")

cb_prettify = CheckBox(app, text="Tick the checkbox to make it Pretty!")

btn_make_name = PushButton(app, text='Make me a hero', command=make_hero_name)
lbl_output = Text(app, text="A hero name will appear here")

# Show the GUI on the screen, start listening to events.
app.display()