If you are interested in digging deeper into the world of GUIs, then I'd like to offer you the following suggestions.
Where do we go from here?
The turtle module
The turtle module is an extended reimplementation of the eponymous module from the Python standard distribution up to version Python 2.5. It's a very popular way to introduce children to programming.
It's based on the idea of an imaginary turtle starting at (0, 0) in the Cartesian plane. You can programmatically command the turtle to move forward and backward, rotate, and so on; by combining all the possible moves, all sorts of intricate shapes and images can be drawn.
It's definitely worth checking out, if only to see something different.
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