Question

我正在使用一个函数，该函数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该关键字，但似乎无法使它对我有用。

到目前为止，我的代码：

from tkinter import Tk
from tkinter import simpledialog, messagebox

def 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?")

我不确定如何在单击所产生的消息框中的“重试”按钮时再次返回上一个问题，以再次请求关键字，以便对任何见解表示赞赏。

Answer 1

askretrycancel始终返回布尔值。当按下Retry键时，返回True和False。您将需要使用while循环，并且在答案正确或按下Cancel之前不要中断循环。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()

Python Tkinter-不确定如何使用messagebox.askretrycancel（）函数

1 个答案: