I don't want to dwell on how all of this works, including inner functions and Python's scoping rules. I do, however, want to ask the question "how can you use Mypy to check all of this?" You could ...

Use a long, hooked device (think paint roller) to pull snake from brush; Pin the snake's head to the ground with your stick; Slide one hand up to the back of the head (you should feel the jawbones) ...