Program crashes when using Python 3.8 or greater

[JonathanB05]

When I run the program using Python 3.7.4, the program runs.
However, when I try to run the program using Python 3.8.5, I get the following error:

Traceback (most recent call last):
  File "__main__.py", line 10, in <module>
    menu_quit, debug = game.main_menu(i, win)
  File "game.py", line 29, in main_menu
    update_keyboard_menu(menu_spot, last_toggle, debug_state, frame)
  File "lib.py", line 34, in update_keyboard_menu
    if (pressed[pygame.K_UP] or pressed[pygame.K_w]) and (pressed[pygame.K_DOWN] or pressed[pygame.K_s]):
IndexError: list index out of range

The same occurs if I run the program use Python 3.9.1.

I noticed that on my computer, Python 3.7 is using Pygame 1.9.6 and Python 3.8 is using Pygame 2.0.0, so this might have something to do with the issue.