用Python写一个贪吃蛇游戏

好的，以下是用Python实现贪吃蛇游戏的代码：

import pygame, random

# 初始化Pygame
pygame.init()

# 定义颜色
WHITE = (255, 255, 255)
BLACK = (0, 0, 0)
RED = (255, 0, 0)
GREEN = (0, 255, 0)
BLUE = (0, 0, 255)

# 定义屏幕大小
SCREEN_WIDTH = 800
SCREEN_HEIGHT = 600

# 创建游戏窗口
screen = pygame.display.set_mode((SCREEN_WIDTH, SCREEN_HEIGHT))
pygame.display.set_caption("贪吃蛇游戏")

# 定义蛇的初始位置
snake_pos = [100, 50]
snake_body = [[100, 50], [90, 50], [80, 50]]

# 定义食物的初始位置
food_pos = [random.randrange(1, (SCREEN_WIDTH//10)) * 10, random.randrange(1, (SCREEN_HEIGHT//10)) * 10]
food_spawned = True

# 定义蛇移动的初始方向
direction = "RIGHT"
change_to = direction

# 定义游戏结束的标志变量
game_over = False

# 定义游戏时钟
clock = pygame.time.Clock()

# 定义字体
font_style = pygame.font.SysFont(None, 50)

# 定义游戏结束的函数
def game_over_screen():
    game_over_msg = font_style.render("游戏结束，按Q退出，按C重新开始", True, RED)
    game_over_rect = game_over_msg.get_rect()
    game_over_rect.center = (SCREEN_WIDTH//2, SCREEN_HEIGHT//2)
    screen.blit(game_over_msg, game_over_rect)
    pygame.display.update()
    pygame.time.wait(500)

    while True:
        for event in pygame.event.get():
            if event.type == pygame.KEYDOWN:
                if event.key == pygame.K_q:
                    pygame.quit()
                    quit()
                elif event.key == pygame.K_c:
                    game_loop()

# 定义游戏循环函数
def game_loop():
    # 使用全局变量
    global direction, change_to, snake_pos, snake_body, food_pos, food_spawned, game_over

    # 循环标志变量
    game_exit = False

    while not game_exit:
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                game_exit = True
            elif event.type == pygame.KEYDOWN:
                if event.key == pygame.K_LEFT and direction != "RIGHT":
                    change_to = "LEFT"
                elif event.key == pygame.K_RIGHT and direction != "LEFT":
                    change_to = "RIGHT"
                elif event.key == pygame.K_UP and direction != "DOWN":
                    change_to = "UP"
                elif event.key == pygame.K_DOWN and direction != "UP":
                    change_to = "DOWN"
                elif event.key == pygame.K_ESCAPE:
                    pygame.quit()
                    quit()

        # 检查方向是否相反
        if change_to == "LEFT" and direction != "RIGHT":
            direction = "LEFT"
        elif change_to == "RIGHT" and direction != "LEFT":
            direction = "RIGHT"
        elif change_to == "UP" and direction != "DOWN":
            direction = "UP"
        elif change_to == "DOWN" and direction != "UP":
            direction = "DOWN"

        # 根据方向移动蛇的位置
        if direction == "LEFT":
            snake_pos[0] -= 10
        elif direction == "RIGHT":
            snake_pos[0] += 10
        elif direction == "UP":
            snake_pos[1] -= 10
        elif direction == "DOWN":
            snake_pos[1] += 10

        # 更新蛇身体的位置
        snake_body.insert(0, list(snake_pos))
        if snake_pos == food_pos:
            food_spawned = False
        else:
            snake_body.pop()

        # 生成新的食物
        if not food_spawned:
            food_pos = [random.randrange(1, (SCREEN_WIDTH//10)) * 10, random.randrange(1, (SCREEN_HEIGHT//10)) * 10]
            food_spawned = True

        # 绘制游戏窗口
        screen.fill(BLACK)
        for pos in snake_body:
            pygame.draw.rect(screen, GREEN, pygame.Rect(pos[0], pos[1], 10, 10))
        pygame.draw.rect(screen, WHITE, pygame.Rect(food_pos[0], food_pos[1], 10, 10))

        # 检查是否碰到边界
        if snake_pos[0] < 0 or snake_pos[0] > SCREEN_WIDTH-10 or snake_pos[1] < 0 or snake_pos[1] > SCREEN_HEIGHT-10:
            game_over = True
            game_over_screen()

        # 检查是否碰到自己
        for block in snake_body[1:]:
            if snake_pos == block:
                game_over = True
                game_over_screen()

        # 更新游戏窗口
        pygame.display.update()

        # 设置游戏时钟
        clock.tick(15)

    # 退出Pygame
    pygame.quit()

# 开始游戏循环
game_loop()

以上代码实现了一个简单的贪吃蛇游戏，你可以在命令行中运行这个Python文件，即可开始游戏。注意，这个游戏需要Pygame库的支持，如果你没有安装这个库，可以使用pip安装，命令如下：

pip install pygame