I tried Bushi's trick once, with similar results. It clearly needs debugging but I'm not the one to do it! Bushi seems to have disappeared from these forums a couple of months ago. One place to start, maybe: "Attribute error" generally means that the function is being attached to the wrong kind of class. But in this case after() is defined in the TKinter documents as belonging to any kind of Widget, including a Frame; and "master" is a Frame. So the problem must be something else.

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