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4.2. Application.__init__(): Constructor

The constructor is quite pro forma: call the parent class constructor, register the application with its .grid() method, create a font, create the widgets, and wait in the main loop.

    def __init__(self):
        """Constructor for the Application class.
        tk.Frame.__init__(self, None)
        self.buttonFont = tkFont.Font(family="Helvetica", size=20)
        self.grid(padx=5, pady=5)