The 'filemenu' does not display when i run the right code, on macOS.

[Raymon9]

Operating system:macOS Sierra 10.12.6
wxPython version:4.0.0b1
Stock or custom build:custom
Python version:Python 3.6.2
Stock or custom build:custom

Description of the problem:
The 'filemenu' does not display when i run the code, which i copied from the wiki of wxpython. My laptop's system is macOS. The problem is not exist when I asked others for help, who use the Windows system. Is this a bug or any other problem? Thank you.
(http://wx4.sinaimg.cn/mw690/4bcb5221ly1firpu66lnsj20sg0wgwha.jpg)

#!/usr/bin/env python3
#-*- coding:utf-8 -*-

import wx

class MainWindow(wx.Frame):
    def __init__(self, parent, title):
        wx.Frame.__init__(self, parent, title=title, size=(200, 100))
        self.control = wx.TextCtrl(self, style=wx.TE_MULTILINE)
        self.CreateStatusBar()
        filemenu = wx.Menu()

        filemenu.Append(wx.ID_ABOUT, '&About', 'Information about this program')
        filemenu.AppendSeparator()
        filemenu.Append(wx.ID_EXIT, '&Exit', 'Terminate the programe')

        menuBar = wx.MenuBar()
        menuBar.Append(filemenu, '&File')
        self.SetMenuBar(menuBar)
        self.Show(True)

app = wx.App(False)
frame = MainWindow(None, 'Sample editor')
app.MainLoop()

[RobinD42]

On Mac the menu items for wx.ID_EXIT, wx.ID_ABOUT and a few others are automatically moved to their correct place (according to Apple UI guidelines) on the application's menu. Until you make an app bundle for your application that will be the "Python" menu next to the apple menu. (With an app bundle then it will be the name you give your application.)

[Raymon9]

Oh, I feel quite ashamed，it looks like a stupid question. Thank you very much for your quick reply.

[jconti13]

I was confused by the same thing, don't feel bad. It actually looks like appending a menu item with wx.ID_EXIT is simply ignored. Simply adding:

menubar` = wx.MenuBar()
self.SetMenuBar(menubar)

Seems to be enough to get the default items including a "Quit" item to appear under the "Python" menu.