py写一个贪吃蛇游戏

好的，我可以为你提供一个简单的贪吃蛇游戏的代码。

import pygame
import random

# 初始化
pygame.init()

# 屏幕尺寸
screen_width = 500
screen_height = 500

# 设置游戏窗口
screen = pygame.display.set_mode((screen_width, screen_height))
pygame.display.set_caption('贪吃蛇')

# 定义颜色
white = (255, 255, 255)
black = (0, 0, 0)
red = (213, 50, 80)
green = (0, 255, 0)

# 蛇的尺寸
snake_size = 10

# 蛇的速度
snake_speed = 15

# 字体
font_style = pygame.font.SysFont(None, 30)


def message(msg, color):
    """
    展示消息
    """
    mesg = font_style.render(msg, True, color)
    screen.blit(mesg, [screen_width / 6, screen_height / 3])


def draw_snake(snake_list):
    """
    绘制蛇
    """
    for x in snake_list:
        pygame.draw.rect(screen, green, [x[0], x[1], snake_size, snake_size])


def game_loop():
    """
    游戏循环
    """
    game_over = False
    game_close = False

    # 蛇的初始位置
    x1 = screen_width / 2
    y1 = screen_height / 2

    # 蛇的移动方向
    x1_change = 0
    y1_change = 0

    # 初始长度
    snake_list = []
    length_of_snake = 1

    # 食物位置
    foodx = round(random.randrange(0, screen_width - snake_size) / 10.0) * 10.0
    foody = round(random.randrange(0, screen_height - snake_size) / 10.0) * 10.0

    while not game_over:

        while game_close:
            screen.fill(white)
            message("你失败了！按Q-退出或C-重新开始", red)
            pygame.display.update()

            for event in pygame.event.get():
                if event.type == pygame.KEYDOWN:
                    if event.key == pygame.K_q:
                        game_over = True
                        game_close = False
                    if event.key == pygame.K_c:
                        game_loop()

        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                game_over = True
            if event.type == pygame.KEYDOWN:
                if event.key == pygame.K_LEFT:
                    x1_change = -snake_size
                    y1_change = 0
                elif event.key == pygame.K_RIGHT:
                    x1_change = snake_size
                    y1_change = 0
                elif event.key == pygame.K_UP:
                    y1_change = -snake_size
                    x1_change = 0
                elif event.key == pygame.K_DOWN:
                    y1_change = snake_size
                    x1_change = 0

        # 判断蛇是否超出屏幕
        if x1 >= screen_width or x1 < 0 or y1 >= screen_height or y1 < 0:
            game_close = True

        # 移动蛇的头部
        x1 += x1_change
        y1 += y1_change

        # 绘制食物
        pygame.draw.rect(screen, red, [foodx, foody, snake_size, snake_size])

        # 添加蛇的头部坐标到列表中
        snake_head = []
        snake_head.append(x1)
        snake_head.append(y1)
        snake_list.append(snake_head)

        # 如果蛇的长度大于指定长度，则删除最后一节
        if len(snake_list) > length_of_snake:
            del snake_list[0]

        # 判断是否吃到食物
        for x in snake_list[:-1]:
            if x == snake_head:
                game_close = True

        # 绘制蛇
        draw_snake(snake_list)

        # 更新屏幕
        pygame.display.update()

        # 判断是否吃到食物
        if x1 == foodx and y1 == foody:
            foodx = round(random.randrange(0, screen_width - snake_size) / 10.0) * 10.0
            foody = round(random.randrange(0, screen_height - snake_size) / 10.0) * 10.0
            length_of_snake += 1

        # 控制游戏速度
        clock = pygame.time.Clock()
        clock.tick(snake_speed)

    # 退出游戏
    pygame.quit()
    quit()


game_loop()

这是一个简单的贪吃蛇游戏，仅供参考。如果您想要更加完整的游戏，可以在此基础上进行扩展。