How do I disable default Tkinter key commands?

I'd like to implement my own key command. However when I do, it does both what I tell it and the default command. How do I disable the default command, so that my command is the only one that runs?

开发者_如何学Go

This is on Windows 7, BTW.

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Put return 'break' at the end of your event handling function. This tells Tkinter not to propagate the event to default handlers.