Tkinter example code for multiple windows, why won't buttons load correctly?

Tkinter example code for multiple windows, why won't buttons load correctly?

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AttributeError: 'set' object has no attribute 'items'

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Pass data frame through Tkinter classes

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Python classes: Inheritance vs Instantiation

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Python: function takes 1 positional argument but 2 were given, how?

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Python Tkinter PhotoImage

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Python: why must Tkinter class instantiation use a Frame?

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Need to call class method from different class without initialization of the first class or some other way around it

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Python GUI with Tkinter and Multiple Files

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TypeError: metaclass conflict: the metaclass of a derived class must be a (non-strict) subclass of the metaclasses of all its bases

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tkinter

Tkinter: One large class for entire application

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Class menu in Tkinter Gui

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error explanation - 'statInter' object has no attribute 'tk'

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Using a Frame class in a Tk class in Python tkinter

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tkinter and scrabble solver problems

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