kivy 无尽的 while 循环

Question

我是 python 和 kivy 的新手，最近我正在尝试制作一个学习应用程序，但我不知道如何让它运行不停歇？这是我的代码

from kivy.app import App
from kivy.uix.gridlayout import GridLayout
from kivy.uix.label import Label
from kivy.uix.image import Image
from kivy.uix.button import Button
from kivy.uix.textinput import TextInput
from random import randrange
import time


#verbs and answers
verbs = ["arise", "awake", "be", "bear", "beat", "become", "begin", "bend", "bet", "bind", "bite", "bleed", "blow", "break", "breed", "bring", "broadcast", "build", "burn", "burst"]
answers =["arose", "awoke", "was", "bore", "beat", "became", "began", "bent", "bet", "bound", "bit", "bled", "blew", "broke", "bred", "brought", "broadcast", "built", "burnt", "burst"]
range = 20


    


rand = randrange(0, range)




class english_learning(App):
    
    def build(self):


        


        self.window = GridLayout()
        self.window.cols = 1
            

        self.window.add_widget(Image(source='cat.png'))

        self.greeting = Label(text=verbs[rand])
        self.window.add_widget(self.greeting)




        self.answer = TextInput(multiline=False)
        self.window.add_widget(self.answer)

        self.button = Button(text="check")
        self.button.bind(on_press=self.check_answer)
        
        self.window.add_widget(self.button)
        return self.window
    def check_answer(self, instance):

        if self.answer.text == answers[rand]:
            self.greeting.text = 'yes!' + self.answer.text + ' is the correct verb'

        else:
            self.greeting.text = "no!"


        

        


        

if __name__ == "__main__":
    english_learning().run()

该应用程序正在请求一个动词，然后检查它是否正确，但它运行了一次。我如何添加 while 循环以使其每次都询问答案并检查它是否正确？

Answer 1

它已经永远存在了，对吧？唯一的问题是它只选择一个词，并永远坚持这个词。所以，当他们猜对时，选择另一个词：

    def check_answer(self, instance):
        global rand
        if self.answer.text == answers[rand]:
            rand = randrange(0,range)
            self.greeting.text = 'yes!' + self.answer.text + ' is the correct verb\n\nNow try: " + verb[rand]
        else:
            self.greeting.text = "no!"

现在，与其使用全局变量，不如将其存储在 class 变量中：

from kivy.app import App
from kivy.uix.gridlayout import GridLayout
from kivy.uix.label import Label
from kivy.uix.image import Image
from kivy.uix.button import Button
from kivy.uix.textinput import TextInput
from random import randrange
import time


#verbs and answers
verbs = ["arise", "awake", "be", "bear", "beat", "become", "begin", "bend", "bet", "bind", "bite", "bleed", "blow", "break", "breed", "bring", "broadcast", "build", "burn", "burst"]
answers =["arose", "awoke", "was", "bore", "beat", "became", "began", "bent", "bet", "bound", "bit", "bled", "blew", "broke", "bred", "brought", "broadcast", "built", "burnt", "burst"]
range = 20



class english_learning(App):
    def build(self):
        self.target = randrange(0, range)

        self.window = GridLayout()
        self.window.cols = 1
        self.window.add_widget(Image(source='cat.png'))

        self.greeting = Label(text=verbs[self.target])
        self.window.add_widget(self.greeting)

        self.answer = TextInput(multiline=False)
        self.window.add_widget(self.answer)

        self.button = Button(text="check")
        self.button.bind(on_press=self.check_answer)
        
        self.window.add_widget(self.button)
        return self.window

    def check_answer(self, instance):

        if self.answer.text == answers[self.target]:
            self.target = randrange(0, range)
            self.greeting.text = 'yes!' + self.answer.text + ' is the correct verb\n\nNow try:' + verbs[self.target]
        else:
            self.greeting.text = "no!"

if __name__ == "__main__":
    english_learning().run()

真的，您可能需要单独一行来表示“动词”和“问候语”。

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