帮我用python写一个贪吃蛇游戏

贪吃蛇是一个经典的游戏，在Python中也可以编写。下面是一个简单的代码实现：

import pygame
import sys
import random

# 初始化Pygame
pygame.init()

# 设置窗口大小
win_width = 720
win_height = 720

# 创建窗口
screen = pygame.display.set_mode((win_width, win_height))

# 设置窗口标题
pygame.display.set_caption("贪吃蛇游戏")

# 设置蛇的初始位置和大小
x = 50
y = 50
block_size = 10

# 设置蛇的初始方向
x_change = 0
y_change = 0

# 定义食物的位置
foodx = round(random.randrange(0, win_width - block_size) / 10.0) * 10.0
foody = round(random.randrange(0, win_height - block_size) / 10.0) * 10.0

# 开始游戏的主循环
while True:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            sys.exit()
        
        # 如果是键盘事件
        if event.type == pygame.KEYDOWN:
            if event.key == pygame.K_LEFT:
                x_change = -block_size
                y_change = 0
            elif event.key == pygame.K_RIGHT:
                x_change = block_size
                y_change = 0
            elif event.key == pygame.K_UP:
                y_change = -block_size
                x_change = 0
            elif event.key == pygame.K_DOWN:
                y_change = block_size
                x_change = 0
                
    # 更新蛇的位置
    x += x_change
    y += y_change
    
    # 绘制蛇和食物
    screen.fill((255, 255, 255))
    pygame.draw.rect(screen, (0, 128, 0), [foodx, foody, block_size, block_size])
    pygame.draw.rect(screen, (255, 0, 0), [x, y, block_size, block_size])
    
    # 刷新窗口
    pygame.display.update()

这是一个简单的贪吃蛇代码的实现