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I have been using classes for only a short while and when I write a method, I make all variables reference self, e.g. self.foo. However, I'm looking through the wxPython in Action book and notice that "self" isn't used all the time. For example: import wx class TextFrame(wx.Frame): def __init__(self): wx.Frame.__init__(self, None, -1, 'Text Entry Example', size=(300, 100)) panel = wx.Panel(self, -1) basicLabel = wx.StaticText(panel, -1, "Basic Control:") basicText = wx.TextCtrl(panel, -1, "I've entered some text!", size=(175, -1)) basicText.SetInsertionPoint(0) pwdLabel = wx.StaticText(panel, -1, "Password:") pwdText = wx.TextCtrl(panel, -1, "password", size=(175, -1), style=wx.TE_PASSWORD) sizer = wx.FlexGridSizer(cols=2, hgap=6, vgap=6) sizer.AddMany([basicLabel, basicText, pwdLabel, pwdText]) panel.SetSizer(sizer) The one below does use "self". import wx class ButtonFrame(wx.Frame): def __init__(self): wx.Frame.__init__(self, None, -1, 'Button Example', size=(300, 100)) panel = wx.Panel(self, -1) self.button = wx.Button(panel, -1, "Hello", pos=(50, 20)) self.Bind(wx.EVT_BUTTON, self.OnClick, self.button) self.button.SetDefault() def OnClick(self, event): self.button.SetLabel("Clicked") If I remember correctly, "self" is reference to a particular instance of the class, so when is it not necessary? Is there a general rule of thumb?

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