如何使用Python Gui中的输入框让程序等待输入？

Question

这是我用来启动程序主要部分的函数的代码，但是我想要一些循环或其他的东西，它会创建十个问题，但是在进入下一个问题之前，要等待输入框的输入。 有什么想法吗？在

def StartGame():
    root = Tk()
    root.title("Maths Quiz - Trigonometry and Pythagoras' Theorem | Start The Game")
    root.geometry("640x480")
    root.configure(background = "gray92")
    global AnswerEntry
    TotScore = 0
    Count = 0
    AnswerReply = None
    WorkingArea = Text(root, width = 70, height = 10, wrap = WORD).place(x = 38, y = 100)
    n = GetRandomNumber()
    Angle,Opposite,Adjacent,Hypotenuse = Triangle()
    Question,RealAnswer = QuestionLibrary(Opposite,Adjacent,Hypotenuse,Angle,n)
    AskQuestion = Label(root, text = Question, wraplength = 560).place(x = 48, y = 300)
    PauseButton = ttk.Button(root, text = "Pause").place(x = 380, y = 10)
    HelpButton = ttk.Button(root, text = "Help", command = helpbutton_click).place(x = 460, y = 10)
    QuitButton = ttk.Button(root, text = "Quit", command = root.destroy).place(x = 540, y = 10)
    AnswerEntry = Entry(root)
    AnswerEntry.place(x = 252, y = 375)
    SubmitButton = ttk.Button(root, text = "Submit", command = submit_answer).place(x = 276, y = 400)
    TotScore,AnswerReply = IsAnswerCorrect(Answer,RealAnswer)
    ScoreLabel = ttk.Label(root, text = TotScore).place(x = 38, y = 10)
    AnswerReplyLabel = ttk.Label(root, text = AnswerReply).place(x = 295, y = 440)
    root.mainloop()

我希望循环在AnswerReply = None之后开始

Answer 1

我不知道Tk，但是没有input text changed的信号吗？应该是肯定的。只要检查一下这个信号是否出现，然后转到新的问题，因为这意味着有人在输入框中输入了一些东西。在

Answer 2

你不需要循环。GUI中唯一真正重要的循环应该是mainloop()，它处理信号并执行回调。在

示例：

try:
    import Tkinter as Tk
except ImportError:
    import tkinter as Tk

class QAGame(Tk.Tk):
    def __init__(self, questions, answers, *args, **kwargs):
        Tk.Tk.__init__(self, *args, **kwargs)
        self.title("Questions and answers game")
        self._setup_gui()
        self._questions = questions[:]
        self._answers = answers
        self._show_next_question()

    def _setup_gui(self):
        self._label_value = Tk.StringVar()
        self._label = Tk.Label(textvariable=self._label_value)
        self._label.pack()
        self._entry_value = Tk.StringVar()
        self._entry = Tk.Entry(textvariable=self._entry_value)
        self._entry.pack()
        self._button = Tk.Button(text="Next", command=self._move_next)
        self._button.pack()

    def _show_next_question(self):
        q = self._questions.pop(0)
        self._label_value.set(str(q))

    def _move_next(self):        
        self._read_answer()
        if len(self._questions) > 0:
            self._show_next_question()
            self._entry_value.set("")
        else:
            self.quit()
            self.destroy()

    def _read_answer(self):
        answer = self._entry_value.get()
        self._answers.append(answer)

    def _button_classification_callback(self, args, class_idx):
        self._classification_callback(args, self._classes[class_idx])
        self.classify_next_plot()

if __name__ == "__main__":
    questions = ["How old are you?",
             "What is your name?"]
    answers = []
    root = QAGame(questions, answers)
    root.mainloop()
    for q,a in zip(questions, answers):
        print "%s\n>>> %s" % (q, a)

我们只有一个标签，一个条目和一个按钮（我不在乎布局！，只要pack()）。在

附加在按钮上的是一个命令（又名回调）。按下按钮后，将读取答案，并将新问题分配给标签。在

从“if名称=”main“块中的示例可以理解此类的用法。请注意：答案列表已填写到位，问题列表保持不变。在