macOS系统用python写一个贪吃蛇游戏

好的，以下是一个简单的贪吃蛇游戏，你可以在macOS系统上使用Python来运行它。

import pygame
import random

# 定义颜色
white = (255, 255, 255)
black = (0, 0, 0)
red = (255, 0, 0)
green = (0, 255, 0)
blue = (0, 0, 255)

# 初始化pygame
pygame.init()

# 设置游戏窗口尺寸
screen_width = 800
screen_height = 600
game_display = pygame.display.set_mode((screen_width, screen_height))

# 设置游戏标题
pygame.display.set_caption('贪吃蛇')

# 设置游戏时钟
clock = pygame.time.Clock()

# 设置方块大小
block_size = 10

# 加载字体
font = pygame.font.SysFont(None, 25)

# 定义函数来显示消息
def message_to_screen(msg, color):
    screen_text = font.render(msg, True, color)
    game_display.blit(screen_text, [screen_width/2, screen_height/2])

# 定义函数来绘制蛇
def draw_snake(block_size, snake_list):
    for block in snake_list:
        pygame.draw.rect(game_display, green, [block[0], block[1], block_size, block_size])

# 定义函数来运行游戏
def run_game():
    game_exit = False
    game_over = False

    # 设置蛇头的初始位置
    lead_x = screen_width / 2
    lead_y = screen_height / 2

    # 设置蛇的初始长度
    snake_list = []
    snake_length = 1

    # 设置食物的初始位置
    rand_food_x = round(random.randrange(0, screen_width - block_size) / 10.0) * 10.0
    rand_food_y = round(random.randrange(0, screen_height - block_size) / 10.0) * 10.0

    # 设置蛇移动的初始方向
    lead_x_change = 0
    lead_y_change = 0

    # 游戏循环
    while not game_exit:
        # 游戏结束后显示消息
        while game_over == True:
            game_display.fill(white)
            message_to_screen('游戏结束，按Q退出或按C重新开始', red)
            pygame.display.update()

            # 处理游戏结束的事件
            for event in pygame.event.get():
                if event.type == pygame.KEYDOWN:
                    if event.key == pygame.K_q:
                        game_exit = True
                        game_over = False
                    if event.key == pygame.K_c:
                        run_game()

        # 处理游戏事件
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                game_exit = True
            if event.type == pygame.KEYDOWN:
                if event.key == pygame.K_LEFT:
                    lead_x_change = -block_size
                    lead_y_change = 0
                elif event.key == pygame.K_RIGHT:
                    lead_x_change = block_size
                    lead_y_change = 0
                elif event.key == pygame.K_UP:
                    lead_y_change = -block_size
                    lead_x_change = 0
                elif event.key == pygame.K_DOWN:
                    lead_y_change = block_size
                    lead_x_change = 0

        # 判断蛇是否撞墙
        if lead_x >= screen_width or lead_x < 0 or lead_y >= screen_height or lead_y < 0:
            game_over = True

        # 更新蛇头的位置
        lead_x += lead_x_change
        lead_y += lead_y_change

        # 绘制游戏背景
        game_display.fill(white)

        # 绘制食物
        pygame.draw.rect(game_display, blue, [rand_food_x, rand_food_y, block_size, block_size])

        # 绘制蛇
        snake_head = []
        snake_head.append(lead_x)
        snake_head.append(lead_y)
        snake_list.append(snake_head)
        if len(snake_list) > snake_length:
            del snake_list[0]

        for segment in snake_list[:-1]:
            if segment == snake_head:
                game_over = True

        draw_snake(block_size, snake_list)

        # 判断蛇是否吃到食物
        if lead_x == rand_food_x and lead_y == rand_food_y:
            rand_food_x = round(random.randrange(0, screen_width - block_size) / 10.0) * 10.0
            rand_food_y = round(random.randrange(0, screen_height - block_size) / 10.0) * 10.0
            snake_length += 1

        # 更新屏幕
        pygame.display.update()

        # 设置游戏帧率
        clock.tick(15)

    # 退出pygame
    pygame.quit()

    # 退出python
    quit()

# 启动游戏
run_game()

希望这个简单的示例能帮助你开始编写自己的贪吃蛇游戏。