What is the proper (or preferred) way to bind an event

[Reverend Jim]

In the book, wxPython in Action (page 65), the following code shows how to bind an event to a frame (self) and to a button. In the case of the frame event (wx.EVT_CLOSE), no source argument is specified because the event is being bound to the object refenced as "self". The source argument is specified for the button binding because it is invoked as self.Bind. In examples I have seen elsewhere, however, the button event is bound to the button as button.Bind(wx.EVT_BUTTON,self.OnEvent,button). I have a few questions:

1) is it better to bind the button event as "self.Bind(event,handler,button)"
2) or as "button.Bind(event,handler)"
3) or as I have seen elsewhere, "button.Bind(event,handler,button)

And if the preferred method is #3, is it necessary to include the source argument when the source is implied as the object for which Bind is being invoked?

def __init__(self, parent, id): 
    wx.Frame.__init__(self, parent, id, 'Frame With Button', 
            size=(300, 100)) 
    panel = wx.Panel(self, -1)                               
    button = wx.Button(panel, -1, "Close", pos=(130, 15), size=(40, 40)) 
    self.Bind(wx.EVT_CLOSE, self.OnCloseWindow)   
    self.Bind(wx.EVT_BUTTON, self.OnCloseMe, button)