写一个python的小游戏贪吃蛇代码

好的，以下是一个简单的贪吃蛇游戏的Python代码：

import pygame
import random

# 初始化Pygame
pygame.init()

# 设置游戏窗口
window_width = 640
window_height = 480
game_window = pygame.display.set_mode((window_width, window_height))
pygame.display.set_caption("贪吃蛇游戏")

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

# 定义蛇的初始位置和方向
snake_x = window_width / 2
snake_y = window_height / 2
snake_direction = "right"

# 定义蛇身列表和初始长度
snake_list = [(snake_x, snake_y)]
snake_length = 1

# 定义食物位置
food_x = round(random.randrange(0, window_width - 10) / 10.0) * 10.0
food_y = round(random.randrange(0, window_height - 10) / 10.0) * 10.0

# 设置游戏时钟
clock = pygame.time.Clock()

# 定义字体
font = pygame.font.SysFont(None, 25)

# 定义游戏结束函数
def game_over():
    message = font.render("Game Over! Press Q-Quit or C-Play Again", True, white)
    message_rect = message.get_rect()
    message_rect.center = (window_width / 2, window_height / 2)
    game_window.blit(message, message_rect)
    pygame.display.update()
    
    while True:
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                pygame.quit()
                quit()
            elif 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():
    global snake_direction, snake_x, snake_y, snake_list, snake_length, food_x, food_y
    
    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 snake_direction != "right":
                    snake_direction = "left"
                elif event.key == pygame.K_RIGHT and snake_direction != "left":
                    snake_direction = "right"
                elif event.key == pygame.K_UP and snake_direction != "down":
                    snake_direction = "up"
                elif event.key == pygame.K_DOWN and snake_direction != "up":
                    snake_direction = "down"
                    
        # 移动蛇头
        if snake_direction == "right":
            snake_x += 10
        elif snake_direction == "left":
            snake_x -= 10
        elif snake_direction == "up":
            snake_y -= 10
        elif snake_direction == "down":
            snake_y += 10
            
        # 检查蛇是否吃到了食物
        if snake_x == food_x and snake_y == food_y:
            food_x = round(random.randrange(0, window_width - 10) / 10.0) * 10.0
            food_y = round(random.randrange(0, window_height - 10) / 10.0) * 10.0
            snake_length += 1
            
        # 更新蛇身列表
        snake_head = (snake_x, snake_y)
        snake_list.append(snake_head)
        if len(snake_list) > snake_length:
            del snake_list[0]
            
        # 检查蛇是否撞到了自己
        for body in snake_list[:-1]:
            if body == snake_head:
                game_over()
                
        # 检查蛇是否撞到了边界
        if snake_x < 0 or snake_x >= window_width or snake_y < 0 or snake_y >= window_height:
            game_over()
            
        # 绘制游戏界面
        game_window.fill(black)
        pygame.draw.rect(game_window, red, [food_x, food_y, 10, 10])
        for body in snake_list:
            pygame.draw.rect(game_window, white, [body[0], body[1], 10, 10])
        pygame.display.update()
        
        # 控制游戏的帧率
        clock.tick(15)

# 开始游戏
game_loop()

# 退出Pygame
pygame.quit()
quit()

运行以上代码，即可开始玩贪吃蛇游戏。按左、右、上、下箭头控制蛇的移动方向，吃到食物后蛇的长度会增加，撞到边界或撞到自己则游戏结束。