How to use 'snake game code in python' in Python

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def run_game():
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    # this function runs the game
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    snake = Snake()
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    apple = Apple()
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    while True:
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        for event in pygame.event.get():
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            if event.type == pygame.QUIT:
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                pygame.quit()
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                sys.exit()
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            elif event.type == pygame.KEYDOWN:
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                if event.key == pygame.K_ESCAPE:
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                    pygame.quit()
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                    sys.exit()
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                # don't move in the opposite direction
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                elif event.key == pygame.K_LEFT and snake.dir != 'r':
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                    snake.dir = 'l'
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                elif event.key == pygame.K_RIGHT and snake.dir != 'l':
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                    snake.dir = 'r'
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                elif event.key == pygame.K_UP and snake.dir != 'd':
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                    snake.dir = 'u'
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                elif event.key == pygame.K_DOWN and snake.dir != 'u':
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                    snake.dir = 'd'
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        if snake.eat(apple):
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            # make a new apple
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            apple = Apple()
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        else:
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            # remove the last segment from the snake (it stayed the same size)
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            del snake.coords[-1]
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        snake.move()
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        if snake.hit():
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            # dead - play the hit sound and return the score
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            snake.hit_snd.play()
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            return len(snake.coords) - 3
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        # Update screen
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        screen.fill(BGCOLOR)
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        draw_grid()
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        draw_score(len(snake.coords) - 3)
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        snake.draw()
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        apple.draw()
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        pygame.display.flip()
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        clock.tick(FPS)