gui

gistfile1.txt

from kivy.lang import Builder
from kivy.app import runTouchApp


runTouchApp(Builder.load_string('''
#:import Factory kivy.factory.Factory
BoxLayout:
    orientation: 'vertical'
    padding: "12dp"
    spacing: "12dp"
    Label:
        text: "Please enter 3 numbers"
    BoxLayout:
        spacing: "10dp"
        Entry:
            id: a
            hint_text: "A"
        Entry:
            id: b
            hint_text: "B"
        Entry:
            id: c
            hint_text: "C"
    Label:
        text: "The sum is {}".format(a.val + b.val + c.val)
            

<Entry@TextInput>:
    input_filter: "float"
    val: float(self.text) if self.text else 0
'''))

kivy_gui.png