python写GUI

import wx
def load(event):
    file = open(filename.GetValue())
    contents.SetValue(file.read())
    file.close()
def save(event):
    file = open(filename.GetValue(),‘w‘)
    file.write(contents.GetValue())
    file.close()
app = wx.App()
win = wx.Frame(None, title = "Simple Editor", size = (410, 335))
bkg = wx.Panel(win)

loadBtn = wx.Button(bkg, label = "Open")
loadBtn.Bind(wx.EVT_BUTTON, load)# 按钮绑定函数

saveBtn = wx.Button(bkg, label = "Save")
saveBtn.Bind(wx.EVT_BUTTON,save)

filename = wx.TextCtrl(bkg)
contents = wx.TextCtrl(bkg, style = wx.TE_MULTILINE|wx.HSCROLL)

hbox = wx.BoxSizer()
hbox.Add(filename, proportion = 1, flag = wx.EXPAND)
hbox.Add(loadBtn, proportion = 0, flag = wx.LEFT, border = 5)
hbox.Add(saveBtn, proportion = 0, flag = wx.LEFT, border = 5)

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()