I try to display Random Strings with random.randint or random.randstr python

I try to make an app that is generating random questions when i press the button "ask" but i am stuck at this error..

{ return self.randrange(a, b+1) TypeError: can only concatenate str (not "int") to str }

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


class MyRoot(BoxLayout):

    def __init__(self):
        super(MyRoot, self).__init__()

    def generate_question(self):
        self.random_question.text = str(random.randint("Is a car a car?", "Is a color a color"))


class RandomQuestionApp(App):
    def build(self):
        return MyRoot()





randomApp = RandomQuestionApp()
RandomQuestionApp().run()

<MyRoot>:
    random_question: random_question
    BoxLayout:
        orientation: "vertical"
        Label:
            text: "Random Question"
            font_size: 30
            color: 0, 0.62, 0.96

        Label:
            id: random_question
            text: "_"
            font_size: 30

        Button:
            text: "Ask"
            font_size: 15
            on_press: root.generate_question()

THANKS !!