This is my Tetris turtle:

When refactoring, I decided that the first things that needed to move were the functions that depended on turtles. They take up a good deal of space, and with a simple comment and a good name for the functions, it’s not hard to make it clear what they’re doing while making the code significantly readable. At the same time, I moved the dictionaries. They, too, take up a crazy amount of space and can easily be called in from another module. The functions connected to piece movement stayed in main.py. They are dependent on having piece, piece_x, piece_y, and piece_h defined. The while loop depends on it as well. As the movement functions are short and relatively clear, I left them where they were in order to avoid complicating the structure of the program.