python使用wxpython开发简单记事本的方法

#!/usr/bin/python 
import wx 
def OnOpen(event): 
  """ 
  Load a file into the textField. 
  """ 
  dialog = wx.FileDialog(None,'Notepad',style = wx.OPEN) 
  if dialog.ShowModal() == wx.ID_OK: 
    filename.SetValue(dialog.GetPath()) 
    file = open(dialog.GetPath()) 
    contents.SetValue(file.read()) 
    file.close() 
  dialog.Destroy() 
def OnSave(event): 
  """ 
  Save text into the orignal file. 
  """ 
  if filename.GetValue() == '': 
    dialog = wx.FileDialog(None,'Notepad',style = wx.SAVE) 
    if dialog.ShowModal() == wx.ID_OK: 
      filename.SetValue(dialog.GetPath()) 
      file = open(dialog.GetPath(), 'w') 
      file.write(contents.GetValue()) 
      file.close() 
    dialog.Destory() 
  else: 
    file = open(filename.GetValue(), 'w') 
    file.write(contents.GetValue()) 
    file.close() 
app = wx.App() 
win = wx.Frame(None, title="Simple Editor", size=(600,400)) 
bkg = wx.Panel(win) 
# Define a 'load' button and its label, 
# bind to an button event with a function 'load' 
loadButton = wx.Button(bkg, label='Open') 
loadButton.Bind(wx.EVT_BUTTON, OnOpen) 
# Define a 'save' button and its label, 
# bind to an button event with a function 'save' 
saveButton = wx.Button(bkg, label='Save') 
saveButton.Bind(wx.EVT_BUTTON, OnSave) 
# Define a textBox for filename. 
filename = wx.TextCtrl(bkg) 
# Define a textBox for file contents. 
contents = wx.TextCtrl(bkg, style=wx.TE_MULTILINE | wx.HSCROLL) 
# Use sizer to set relative position of the components. 
# Horizontal layout 
hbox = wx.BoxSizer() 
hbox.Add(filename, proportion=1, flag=wx.EXPAND) 
hbox.Add(loadButton, proportion=0, flag=wx.LEFT, border=5) 
hbox.Add(saveButton, proportion=0, flag=wx.LEFT, border=5) 
# Vertical layout 
vbox = wx.BoxSizer(wx.VERTICAL) 
vbox.Add(hbox, proportion=0, flag=wx.EXPAND | wx.ALL, border=5) 
vbox.Add(contents, proportion=1, 
     flag=wx.EXPAND | wx.LEFT | wx.BOTTOM | wx.RIGHT, border=5) 
bkg.SetSizer(vbox) 
win.Show() 
app.MainLoop()