How does your application start?

[7stud]

Say you have this code:

-----
import wx

class MyApp(wx.App):

    def OnInit(self):
        frame = wx.Frame(None)
        frame.Show()
        return True

app = MyApp() 
app.MainLoop()
-----

If you define an __init__() method and then inside the method you 
relay self to wx.App's __init__() method, for instance:

wx.App__init__(self)

then it seems likely that inside wx.App.__init__() there will be a call 
to self.OnInit() to start your app.  

However, if you don't define an __init__() method, how does 
wx.App.__init__() start your app?  How does it 
get a reference to your app?

Thanks.