keypad sample for guizero

keypad.py

from guizero import App, Box, PushButton, Text

def keypad_update():
    result.clear()
    result.append("{:,}".format(int(buf)))

def keypad_input(i):
    global buf
    if i < 10:
        if buf == "0":
            buf = ""
        buf += str(i)
        keypad_update()
    elif i == 10:
        buf = "0"
        keypad_update()
    elif i == 11:
        print(buf)

app = App(title="keypad")
app.full_screen = True
buf = "0"

screen_keypad = Box(app, visible=True, width="fill")
keypad_button = Box(screen_keypad, layout="grid", width="fill", align="left")
keypad_result = Box(screen_keypad, width="fill", align="right")

button = list()
for i in range(0,10):
    x = int((i + 2) % 3) if i else 0
    y = 3 - int((i + 2) / 3)
    button.append(PushButton(keypad_button, text=str(i), grid=[x,y], padx=30, command=keypad_input, args=[i]))
    button[i].text_size = 40

button.append(PushButton(keypad_button, text="C", grid=[2,3], padx=30, command=keypad_input, args=[10]))
button.append(PushButton(keypad_button, text="⏎", grid=[0,4,3,4], padx=120, command=keypad_input, args=[11]))
button[10].text_size = 40
button[11].text_size = 40
result = Text(keypad_result, text="0", size=40)

app.display()