不重复的随机问题 python kivy

Question

我正在构建一个测验应用程序，问题和答案选项在屏幕上显示的图像中。 每个问题都有自己的屏幕，一切正常，但我现在尝试做的是随机调用这些屏幕，这也有效，但我现在想做的是不要让应用程序再次显示相同的问题（屏幕）和每次我启动应用程序时也是从同一个屏幕开始的。 我试图用 np.random.permutation 做一些事情，但没有成功。我需要提到我是 python / kivy 的新手。 有人在这里帮助我通过这一步吗？ 感谢您的帮助 ！！

from kivy.app import App
from kivy.uix.screenmanager import ScreenManager, Screen
import random
import numpy as np


class Q1(Screen):
    pass


class Q2(Screen):
    pass


class Q3(Screen):
    pass


class Q4(Screen):
    pass


class WrongAnswer(Screen):
    pass


class TestApp(App):

    def wrong_answer(self):
        screen = ['WrongAnswer']
        return random.choice(screen)

    def random_screen(self):
        screens = list(np.random.permutation(np.arange(0,4))['Q1', 'Q2', 'Q3', 'Q4'])
        return random.choice(screens)

    def build(self):

        sm = ScreenManager()
        sm.add_widget(Q1(name='Q1'))
        sm.add_widget(Q2(name='Q2'))
        sm.add_widget(Q3(name='Q3'))
        sm.add_widget(Q4(name='Q4'))
        sm.add_widget(WrongAnswer(name='WrongAnswer'))

        return sm


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

<Q1>:
    Image:
        source: 'Q1.png'

        FloatLayout:
            size: root.width, root.height/2

            Button:
                size_hint: 0.3, 0.25
                pos_hint: {"x":0.09, "top":1.16}
                background_color: 1, 1, 1, 0.2
                on_release: root.manager.current = app.random_screen()

            Button:
                size_hint: 0.3, 0.25
                pos_hint: {"x":0.5, "top":1.16}
                background_color: 1, 1, 1, 0.2
                on_release: root.manager.current = app.wrong_answer()

            Button:
                size_hint: 0.3, 0.25
                pos_hint: {"x":0.5, "top":0.7}
                background_color: 1, 1, 1, 0.2
                on_release: root.manager.current = app.wrong_answer()

            Button:
                size_hint: 0.3, 0.25
                pos_hint: {"x":0.09, "top":0.7}
                background_color: 1, 1, 1, 0.2
                on_release: root.manager.current = app.wrong_answer()


<Q2>:
    Image:
        source: 'Q2.png'

        FloatLayout:
            size: root.width, root.height/2

            Button:
                size_hint: 0.3, 0.25
                pos_hint: {"x":0.09, "top":1.16}
                background_color: 1, 1, 1, 0.2
                on_release: root.manager.current = app.wrong_answer()

            Button:
                size_hint: 0.3, 0.25
                pos_hint: {"x":0.5, "top":1.16}
                background_color: 1, 1, 1, 0.2
                on_release: root.manager.current = app.random_screen()

            Button:
                size_hint: 0.3, 0.25
                pos_hint: {"x":0.5, "top":0.7}
                background_color: 1, 1, 1, 0.2
                on_release: root.manager.current = app.wrong_answer()

            Button:
                size_hint: 0.3, 0.25
                pos_hint: {"x":0.09, "top":0.7}
                background_color: 1, 1, 1, 0.2
                on_release: root.manager.current = app.wrong_answer()

<Q3>:
    Image:
        source: 'Q3.png'

        FloatLayout:
            size: root.width, root.height/2

            Button:
                size_hint: 0.3, 0.25
                pos_hint: {"x":0.09, "top":1.16}
                background_color: 1, 1, 1, 0.2
                on_release: root.manager.current = app.wrong_answer()

            Button:
                size_hint: 0.3, 0.25
                pos_hint: {"x":0.5, "top":1.16}
                background_color: 1, 1, 1, 0.2
                on_release: root.manager.current = app.wrong_answer()

            Button:
                size_hint: 0.3, 0.25
                pos_hint: {"x":0.5, "top":0.7}
                background_color: 1, 1, 1, 0.2
                on_release: root.manager.current = app.wrong_answer()

            Button:
                size_hint: 0.3, 0.25
                pos_hint: {"x":0.09, "top":0.7}
                background_color: 1, 1, 1, 0.2
                on_release: root.manager.current = app.random_screen()

<Q4>:
    Image:
        source: 'Q4.png'

        FloatLayout:
            size: root.width, root.height/2

            Button:
                size_hint: 0.3, 0.25
                pos_hint: {"x":0.09, "top":1.16}
                background_color: 1, 1, 1, 0.2
                on_release: root.manager.current = app.random_screen()

            Button:
                size_hint: 0.3, 0.25
                pos_hint: {"x":0.5, "top":1.16}
                background_color: 1, 1, 1, 0.2
                on_release: root.manager.current = app.wrong_answer()

            Button:
                size_hint: 0.3, 0.25
                pos_hint: {"x":0.5, "top":0.7}
                background_color: 1, 1, 1, 0.2
                on_release: root.manager.current = app.wrong_answer()

            Button:
                size_hint: 0.3, 0.25
                pos_hint: {"x":0.09, "top":0.7}
                background_color: 1, 1, 1, 0.2
                on_release: root.manager.current = app.wrong_answer()

<WrongAnswer>:
    Image:
        source: 'L1.png'