Python：由于while循环导致的Tkinter停止

Question

我想在我的程序中运行一个while循环，但是当while循环就位时，代码停止，并且tkinter窗口无法打开。我该如何解决这个问题？应该这样，代码写出两个随机数，然后当输入正确的答案时，它应该重新循环。

from tkinter import * 
import random 

root = Tk() 

#Frames 
topFrame = Frame(root) # I want an invisible container in root 
topFrame.pack() 
bottomFrame = Frame(root) # I want an invisible container in root 
bottomFrame.pack(side=BOTTOM) 
#End Of Frames 

#Addition Question Maker 



AnswerBox = Entry(topFrame) 
AnswerBox.grid(row=0,column=4) 
EqualsSign = Label(topFrame, text="=").grid(row=0,column=3) 
AdditionSign = Label(topFrame, text="+").grid(row=0,column=1) 

NewQuestion = True 

while NewQuestion == True: 
    AdditionQuestionLeftSide = random.randint(0, 10) 
    AdditionQuestionRightSide = random.randint(0, 10) 
    global Total 
    Total = AdditionQuestionLeftSide + AdditionQuestionRightSide 
    AdditionQuestionRightSide = Label(topFrame, text= AdditionQuestionRightSide).grid(row=0,column=0) 
    AdditionQuestionLeftSide= Label(topFrame, text= AdditionQuestionLeftSide).grid(row=0,column=2) 
    answer = None 


def OutputAnswerText(event): 
    global answer 
    answer = AnswerBox.get() 
    if Total == int(answer): 
     Correct = Label(topFrame, text="Correct").grid(row=2,column=3) 
     NewQuestion = True 
    else: 
     Correct = Label(topFrame, text="Wrong").grid(row=2,column=3) 

AnswerBox.bind('<Return>', OutputAnswerText) 

root.mainloop() 

Answer 1

你有一个无限循环：

while NewQuestion == True: 

没有地方NewQuestion可以成为假（和在循环中没有休息）。所以循环是无限的。

另外：

EqualsSign = Label(topFrame, text="=").grid(row=0,column=3) 

不起作用，因为grid回报None。如果你想保持到窗口小部件的引用，您必须使用两行版本像：

AnswerBox = Entry(topFrame) 
AnswerBox.grid(row=0,column=4) 

Answer 2

使while循环相反的，我建议作出NewQuestion功能。该函数最初被调用，然后如果答案正确，该函数会再次被调用。这里是我的函数代码，以及一个自动输入删除选项，以消除在输入正确答案后退格您的答案的需要。

from tkinter import * 
import random 

root = Tk() 

#Frames 
topFrame = Frame(root) # I want an invisible container in root 
topFrame.pack() 
bottomFrame = Frame(root) # I want an invisible container in root 
bottomFrame.pack(side=BOTTOM) 
#End Of Frames 

#Addition Question Maker 



AnswerBox = Entry(topFrame) 
AnswerBox.grid(row=0,column=4) 
EqualsSign = Label(topFrame, text="=").grid(row=0,column=3) 
AdditionSign = Label(topFrame, text="+").grid(row=0,column=1) 


def NewQuestion(): 
    AdditionQuestionLeftSide = random.randint(0, 10) 
    AdditionQuestionRightSide = random.randint(0, 10) 
    global Total 
    Total = AdditionQuestionLeftSide + AdditionQuestionRightSide 
    AdditionQuestionRightSide = Label(topFrame, text= AdditionQuestionRightSide).grid(row=0,column=0) 
    AdditionQuestionLeftSide= Label(topFrame, text= AdditionQuestionLeftSide).grid(row=0,column=2) 
    answer = None 
    return 

NewQuestion() 

def OutputAnswerText(event): 
    global answer 
    global AnswerBox 
    answer = AnswerBox.get() 
    if Total == int(answer): 
     Correct = Label(topFrame, text="Correct").grid(row=2,column=3) 
     AnswerBox.delete(0, END) 
     NewQuestion() 
    else: 
     Correct = Label(topFrame, text="Wrong").grid(row=2,column=3) 

AnswerBox.bind('<Return>', OutputAnswerText) 

root.mainloop()