如何在wxpython中创建wx.ITEM_下拉列表

我是wxpython的新手，我想在工具栏中创建一个选项按钮，代码在下面，但他没有生效，我不知道出了什么问题，你能给我一些建议吗，谢谢

import wx


class Mywin(wx.Frame):
    def __init__(self, parent, title):
        super(Mywin, self).__init__(parent, title=title)
        self.InitUI()
    def InitUI(self):
        menubar = wx.MenuBar()
        menu = wx.Menu()
        menubar.Append(menu, "File")
        self.SetMenuBar(menubar)
        tb = wx.ToolBar(self, -1,style=wx.TB_TEXT|wx.TB_FLAT|wx.TB_HORZ_TEXT|wx.TB_HORZ_LAYOUT|wx.TB_TOP)#wx.TB_BOTTOM wx.TB_DOCKABLE
        tb.SetToolSeparation(22)
        tb.AddTool(101, 'what', wx.Bitmap("中国电信.png"), "开始",wx.ITEM_DROPDOWN)
        menu = wx.Menu()
        item = wx.MenuItem(menu, 222, "查看", "跳转到url")
        menu.AppendItem(item)
        bool = tb.SetDropdownMenu(101,menu)
        print(bool)
        tb.Bind(wx.EVT_TOOL_DROPDOWN,self.OnDropDown)
        tb.Bind(wx.EVT_TOOL, self.Onright)
        tb.Realize()
        self.SetSize((700, 250))

        #self.text = wx.TextCtrl(self, -1, style=wx.EXPAND | wx.TE_MULTILINE)
        self.Centre()
        self.Show(True)
    def OnDropDown(self,event):
        print(event)

    def Onright(self, event):
        print(event)
        self.text.AppendText(str(event.GetId()) + "\n")
        event.Skip()



ex = wx.App()
Mywin(None, 'ToolBar demo')
ex.MainLoop()

---

这是演示，你能告诉我你的版本是2.7还是3.0吗

#!/usr/bin/python
# -*- coding: utf-8 -*-

'''
ZetCode wxPython tutorial

This example shows a simple menu.

author: Jan Bodnar
website: www.zetcode.com
last modified: September 2011
'''
import wx

class Example(wx.Frame):

    def __init__(self, *args, **kwargs):
        super(Example, self).__init__(*args, **kwargs) 

        self.InitUI()

    def InitUI(self):    

        menubar = wx.MenuBar()
        fileMenu = wx.Menu()
        fitem = fileMenu.Append(wx.ID_EXIT, 'Quit', 'Quit application')
        menubar.Append(fileMenu, '&File')
        self.SetMenuBar(menubar)

        self.Bind(wx.EVT_MENU, self.OnQuit, fitem)

        self.SetSize((300, 200))
        self.SetTitle('Simple menu')
        self.Centre()
        self.Show(True)

    def OnQuit(self, e):
        self.Close()

def main():
    ex = wx.App()
    Example(None)
    ex.MainLoop()    


if __name__ == '__main__':
    main()

---

这是演示，你能告诉我你的版本是2.7还是3.0吗

#!/usr/bin/python
# -*- coding: utf-8 -*-

'''
ZetCode wxPython tutorial

This example shows a simple menu.

author: Jan Bodnar
website: www.zetcode.com
last modified: September 2011
'''
import wx

class Example(wx.Frame):

    def __init__(self, *args, **kwargs):
        super(Example, self).__init__(*args, **kwargs) 

        self.InitUI()

    def InitUI(self):    

        menubar = wx.MenuBar()
        fileMenu = wx.Menu()
        fitem = fileMenu.Append(wx.ID_EXIT, 'Quit', 'Quit application')
        menubar.Append(fileMenu, '&File')
        self.SetMenuBar(menubar)

        self.Bind(wx.EVT_MENU, self.OnQuit, fitem)

        self.SetSize((300, 200))
        self.SetTitle('Simple menu')
        self.Centre()
        self.Show(True)

    def OnQuit(self, e):
        self.Close()

def main():
    ex = wx.App()
    Example(None)
    ex.MainLoop()    


if __name__ == '__main__':
    main()

---

那么你得到了什么错误？没有任何提示，但是下拉菜单没有显示查看错误报告和错误修复那么你得到了什么错误？没有任何提示，但是下拉菜单没有显示查看错误报告和错误修复