maze.py

@dataclass
class Maze:
    width = 12
    height = 8


def maze_renderer(m: Maze, conf: GameConf):
    px_size = min(conf.window_width//m.width, conf.window_height//m.height)
    suf = pygame.Surface((px_size*m.width, px_size*m.height))
    for x in range(0, px_size*m.width, px_size):
        for y in range(0, px_size*m.height, px_size):
            suf.fill((x % 256, y % 256, 100), (x, y, px_size, px_size))
    return suf


if __name__ == "__main__":
    conf = GameConf()
    game = Game(conf)
    m = Maze()

    def draw():
        game.screen.fill(conf.background_color)
        surface = maze_renderer(m, conf)
        rect = surface.get_rect(
            center=(conf.window_width//2, conf.window_height//2))
        game.screen.blit(surface, rect)

    setattr(game, "draw", draw)
    game.run()

pygame.py

import sys
import pygame
from dataclasses import dataclass


@dataclass
class GameConf:
    window_width: int = 640
    window_height: int = 480
    caption: str = "game window"
    fps: int = 60
    font_size: int = 24
    background_color: str = "gray"
    debug: bool = True

    @property
    def window_size(self):
        return (self.window_width, self.window_height)


class Game:
    def __init__(self, conf: GameConf) -> None:
        pygame.init()
        self.screen = pygame.display.set_mode(conf.window_size)
        pygame.display.set_caption(conf.caption)
        self.font = pygame.font.Font(None, conf.font_size)
        self.clock = pygame.time.Clock()
        self.conf = conf

    def handle_event(self) -> None:
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                self.running = False

    def draw(self) -> None:
        self.screen.fill(self.conf.background_color)

    def debug(self) -> None:
        text = self.font.render("FPS: %.02f" %
                                self.clock.get_fps(), False, "black")
        self.screen.blit(text, (0, 0))

    def run(self) -> None:
        self.running = True

        while self.running:
            self.handle_event()
            self.draw()

            if self.conf.debug:
                self.debug()

            pygame.display.update()
            self.clock.tick(self.conf.fps)

        pygame.quit()
        sys.exit()


if __name__ == "__main__":
    conf = GameConf()
    game = Game(conf)
    game.run()