Verify Exit Dialog (wxPython)

# wxPython Frame with menubar, statusbar, and verify exit dialog
# tested with Python24 and wxPython26   by  HAB

import wx

ID_EXIT  = 102  # needed for menu

class MyFrame(wx.Frame):
    """make a frame, with menu, statusbar and exit-dialog, inherits wx.Frame"""
    def __init__(self):
        # create a frame/window, no parent, default to wxID_ANY
        wx.Frame.__init__(self, None, wx.ID_ANY, 'wxPython', pos=(300, 150), size=(300, 350))
        
        # create statusbar (bottom)
        self.CreateStatusBar()
        self.SetStatusText("This is the statusbar")
        
        menu = wx.Menu()
        # "Quit this program" shows in statusbar
        menu.Append(ID_EXIT, "Exit", "Quit this program")
        
        # create menubar (top)
        menuBar = wx.MenuBar()
        menuBar.Append(menu, "File")  # usual title
        self.SetMenuBar(menuBar)

        # bind menu exit
        self.Bind(wx.EVT_MENU, self.onMenuExit, id=ID_EXIT)
        # responds to exit symbol x on frame title bar
        self.Bind(wx.EVT_CLOSE, self.onCloseWindow)

        # show frame
        self.Show(True)
        
    def onMenuExit(self, event):
        # via wx.EVT_CLOSE event, also triggers exit dialog
        self.Close(True)

    def onCloseWindow(self, event):
        # dialog to verify exit (including menuExit)
        dlg = wx.MessageDialog(self, "Want to exit?", "Exit", wx.YES_NO | wx.ICON_QUESTION)
        if dlg.ShowModal() == wx.ID_YES:
            self.Destroy()  # frame
        dlg.Destroy()

application = wx.PySimpleApp()
# create instance of class MyFrame
window = MyFrame()
# start event loop
application.MainLoop()