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Simple Hello World Program Summary

• Tkinter.py holds all the class descriptions for the Tk toolkit
• Applications are created by subclassing an existing widget. Frames and Canvases are common choices from which to subclass.
• Callbacks to widgets can either be methods or regular functions.
• Widget constructors take a parameter that denotes the master of the new widget. A widget's master will control where the widget appears in the application and how large it is.
• The actual location and size of a widget is determined by the Packer.
• Before a widget appears on the screen, you must call either pack or place on it.
• somewidget.mainloop() starts the program running
• Other simple example programs can be found in a example tkinter programs repository