from random import randint

from kivy.app import App
from kivy.uix.boxlayout import BoxLayout


class RanNum(BoxLayout):
    pass


class RanKivApp(App):
    def build(self):
        return RanNum()

    def generate_random_number(self):
        try:
            upper_boundary = int(self.root.ids.upper_boundary_input.text)
            self.root.ids.output.text = str(randint(1, upper_boundary))
        except ValueError:
            self.root.ids.output.text = 'Bitte nur positive,\nganze Zahlen eingeben!'


if __name__ == '__main__':
    RanKivApp().run()