Python Tkinter - 不确定如何使用 messagebox.askretr

Question

我有一个正在处理的函数，它根据输入的关键字显示不同的数字，并决定使用 simpledialog.askstring() 来显示一个消息框，我可以在其中输入我的关键字。当我输入错误的关键字时，我想显示一个消息框，询问我是否要重试并重新输入关键字，但我似乎无法让它为我工作。到目前为止我的代码：from tkinter import Tkfrom tkinter import simpledialog, messageboxdef display_figure():    application_window = Tk()    application_window.withdraw()    answer = simpledialog.askstring("Input", "What figure do you want to look at: 'Fig1', 'Fig2', 'Fig3', or 'Fig4'?", parent=application_window)    if   answer == 'Fig1': (Code to display Fig1)    elif answer == 'Fig2': (Code to display Fig2)    elif answer == 'Fig3': (Code to display Fig3)    elif answer == 'Fig4': (Code to display Fig4)    else: messagebox.askretrycancel("Question", "Error: Not a recognized keyword. Do you want to try again?")当单击生成的消息框中的“重试”按钮时，我不确定如何循环回到上一个问题以再次询问关键字，因此将不胜感激。

Answer 1

askretrycancel总是返回布尔值。按下时重试返回True，False按下时取消。您将需要使用while循环并且在答案正确或Cancel按下之前不要破坏它。这是代码：

from tkinter import Tk

from tkinter import simpledialog, messagebox

def display_figure():

    application_window = Tk()

    application_window.withdraw()

    while True:

        answer = simpledialog.askstring("Input", "What figure do you want to look at: 'Fig1', 'Fig2', 'Fig3', or 'Fig4'?", parent=application_window)

        if   answer == 'Fig1': print(answer);break

        elif answer == 'Fig2': print(answer);break

        elif answer == 'Fig3': print(answer);break

        elif answer == 'Fig4': print(answer);break

        else:

            if messagebox.askretrycancel("Question", "Error: Not a recognized keyword. Do you want to try again?") == False:

                break

display_figure()