Pygame "Hello World"

helloworld.py

import random

import pygame

class GameOver(Exception):
    pass


SIZE = 800,600

def init():
    global Screen
    Screen = pygame.display.set_mode(SIZE)


def rcolor() -> tuple:
    return tuple(random.randrange(0, 256, 20) for _ in "rgb")


def process_events():
    for event in pygame.event.get():
        if event.type == pygame.KEYDOWN:
            if event.key == pygame.K_ESCAPE:
                raise GameOver()

def main():
    while True:
        Screen.fill(rcolor())
        process_events()
        pygame.display.flip()
        pygame.time.delay(100)

if __name__ == "__main__":
    try:
        init()
        main()
    finally:
        pygame.quit()