Python TkMessageBox问题无效!

Question

我有一个将输出写入文件的按钮.并检查具有该文件名的文件是否已存在.它应该要求用户覆盖或不覆盖？但它没有用.如果用户说"否",则程序仍将覆盖该文件.

这是弹出MessageBox的代码:

    if os.path.exists(self.filename.get()):
        tkMessageBox.showinfo('INFO', 'File already exists, want to override?.')

Answer 1

您需要使用具有yes/no或ok/cancel按钮的对话框,并且需要捕获该对话框的返回值以了解用户单击的内容.然后,您可以决定是否写入文件.

例如:

import Tkinter as tk
import tkMessageBox

class SampleApp(tk.Tk):
    def __init__(self, *args, **kwargs):
        tk.Tk.__init__(self, *args, **kwargs)
        self.button = tk.Button(self, text="Push me", command=self.OnButton)
        self.button.pack()

    def OnButton(self):
        result = tkMessageBox.askokcancel(title="File already exists", 
                                       message="File already exists. Overwrite?")
        if result is True:
            print "User clicked Ok"
        else:
            print "User clicked Cancel"

if __name__ == "__main__":
    app = SampleApp()
    app.mainloop()

effbot.org在标准对话框上有一个很好的小写