wxpython enable and disable toolbar buttons

wxpython enable and disable toolbar buttons

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import wx   class Example(wx.Frame):           def __init__(self, *args, **kwargs):         super(Example, self).__init__(*args, **kwargs)                       self.InitUI()               def InitUI(self):              self.count = 5           self.toolbar = self.CreateToolBar()         tundo = self.toolbar.AddLabelTool(wx.ID_UNDO, '', wx.Bitmap('img/blogger.png'))         tredo = self.toolbar.AddLabelTool(wx.ID_REDO, '', wx.Bitmap('img/youtube.png'))         self.toolbar.EnableTool(wx.ID_REDO, False)         self.toolbar.AddSeparator()         texit = self.toolbar.AddLabelTool(wx.ID_EXIT, '', wx.Bitmap('img/icon_shortcut_tickets.png'))         self.toolbar.Realize()           self.Bind(wx.EVT_TOOL, self.OnQuit, texit)         self.Bind(wx.EVT_TOOL, self.OnUndo, tundo)         self.Bind(wx.EVT_TOOL, self.OnRedo, tredo)           self.SetSize((250, 200))         self.SetTitle('Undo redo')         self.Centre()         self.Show(True)               def OnUndo(self, e):         if self.count > 1 and self.count <= 5:             self.count = self.count - 1           if self.count == 1:             self.toolbar.EnableTool(wx.ID_UNDO, False)           if self.count == 4:             self.toolbar.EnableTool(wx.ID_REDO, True)       def OnRedo(self, e):         if self.count < 5 and self.count >= 1:             self.count = self.count + 1           if self.count == 5:             self.toolbar.EnableTool(wx.ID_REDO, False)           if self.count == 2:             self.toolbar.EnableTool(wx.ID_UNDO, True)                    def OnQuit(self, e):         self.Close()   def main():           ex = wx.App()     Example(None)     ex.MainLoop()        if __name__ == '__main__':     main()