改变关闭窗口的默认行为

python 2.x

from Tkinter import *
import tkMessageBox


app = Tk()
app.title("HelloWorld")
app.geometry('250x100+200+100')

def shutdown():
    if tkMessageBox.askokcancel(title = 'Are you sure?', message = 'Do you really want to quit?'):
        app.destroy()
    
app.protocol("WM_DELETE_WINDOW", shutdown)
app.mainloop()