字典中的wxPython菜單：如何以正確的順序顯示菜單，它出現在字典中？

Question

我收到了一本字典，其中的關鍵是菜單，值是菜單項，我想用它來爲我的程序創建MenuBar，但是我在創建菜單時遇到了麻煩，它們沒有按照我的意願出現，如下所示：

'文件|編輯|工具|幫助」

這裏是我的代碼：

# -*- coding: utf-8 -*- 
__author__ = 'Nilson Lopes' 

import wx 


class MainFrame(wx.Frame): 
    __menu_options = {'File': ['New', 'Open', 'SEP', 'Quit'], 
        'Edit': ['Copy\tCtrl+C', 'Cut\tCtrl+X', 'Paste\tCtrl+V'], 
        'Tools': ['Settings'], 
        'Help': ['Context', 'About']} 

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

    ''' 
    def on_new(self, event): 
     print 'New called from function' 
     event.Skip() 

    def on_open(self, event): 
     print 'Open called from function' 
     event.Skip() 

    __actions__ = {'New': on_new(), 'Open': on_open()} 
    ''' 
    def create_menu(self): 
     menu_bar = wx.MenuBar() 
     for option, menu_items in self.__menu_options.items(): 
      #print option 
      if type(menu_items) is list: 
       main_menu = wx.Menu() 
       for menu in self.__menu_options[option]: 
        #print '\t', menu 
        if menu == 'SEP': 
         main_menu.AppendSeparator() 
        else: 
         main_menu.Append(wx.NewId(), str(menu)) 

      menu_bar.Append(main_menu, '&'+str(option).capitalize()) 
     self.SetMenuBar(menu_bar) 


class MainApp(wx.App): 

    def OnInit(self): 
     self.frame = MainFrame(None, title='Main Application') 
     self.frame.Show() 
     return True 


def app_run(): 
    app = MainApp(False) 
    app.MainLoop() 

if __name__ == '__main__': 
    app_run() 

詳情： 我使用python 2.7使用wxPython的（鳳凰城）在Windows 8

Answer 1

dict不是一個有序映射運行。

>>> d = {'key1': 1, 'key2': 2, 'key3': 3, 'key4': 4} 
>>> list(d) # Iterating `dict` yields keys in abitrary order. 
['key3', 'key2', 'key1', 'key4'] 

如果要保留項目的順序，您應該使用collections.OrderedDict。

>>> d = OrderedDict([('key1', 1), ('key2', 2), ('key3', 3), ('key4', 4)]) 
>>> list(d) 
['key1', 'key2', 'key3', 'key4'] 

---

from collections import OrderedDict 

.... 

__menu_options = OrderedDict([ 
    ('File', ['New', 'Open', 'SEP', 'Quit']), 
    ('Edit', ['Copy\tCtrl+C', 'Cut\tCtrl+X', 'Paste\tCtrl+V']), 
    ('Tools', ['Settings']), 
    ('Help', ['Context', 'About']), 
])