帮我用Python写个贪吃蛇

抱歉，作为AI语言模型，我目前没法编写Python代码。但是，以下是一个简单的Python贪吃蛇游戏的代码示例，你可以参考它进行修改和学习。

import pygame
import random
 
pygame.init()
 
# 设置屏幕宽度和高度
SCREEN_WIDTH = 600
SCREEN_HEIGHT = 480
 
# 设置蛇头初始坐标
x = 200
y = 200
 
# 设置蛇身列表
snake_list = []
snake_length = 1
 
# 设置方格大小
block_size = 10
 
# 创建屏幕对象
screen = pygame.display.set_mode((SCREEN_WIDTH, SCREEN_HEIGHT))
 
# 设置游戏名字
pygame.display.set_caption('Python贪吃蛇游戏')
 
# 设置颜色
WHITE = (255, 255, 255)
BLACK = (0, 0, 0)
GREEN = (0, 255, 0)
RED = (255, 0, 0)
BLUE = (0, 0, 255)
 
# 设置游戏结束状态
game_over = False
 
# 设置时钟
clock = pygame.time.Clock()
 
# 设置食物对象
food_block = {'x': random.randrange(0, SCREEN_WIDTH//block_size)*block_size,
              'y': random.randrange(0, SCREEN_HEIGHT//block_size)*block_size}
 
# 设置字体
font = pygame.font.SysFont(None, 25)
 
# 画蛇函数
def draw_snake(snake_list, block_size):
    for x in snake_list:
        pygame.draw.rect(screen, GREEN, [x[0], x[1], block_size, block_size])
 
# 提示文字函数
def message_to_screen(msg, color):
    screen_text = font.render(msg, True, color)
    screen.blit(screen_text, [SCREEN_WIDTH/6, SCREEN_HEIGHT/3])

# 开始游戏
while not game_over:
    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:
                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
    
    # 移动蛇头位置
    x += x_change
    y += y_change
    
    # 判断是否吃到食物
    if x == food_block['x'] and y == food_block['y']:
        food_block = {'x': random.randrange(0, SCREEN_WIDTH//block_size)*block_size,
                      'y': random.randrange(0, SCREEN_HEIGHT//block_size)*block_size}
        snake_length += 1
    
    # 设置背景颜色
    screen.fill(BLACK)
    
    # 画食物
    pygame.draw.rect(screen, RED, [food_block['x'], food_block['y'], block_size, block_size])
    
    snake_head = []
    snake_head.append(x)
    snake_head.append(y)
    snake_list.append(snake_head)
    if len(snake_list) > snake_length:
        del snake_list[0]
    
    # 判断是否撞墙或越界
    if x >= SCREEN_WIDTH or x < 0 or y >= SCREEN_HEIGHT or y < 0:
        game_over = True
    
    # 判断是否撞到自己
    for block in snake_list[:-1]:
        if block == snake_head:
            game_over = True
    
    # 画蛇和字体
    draw_snake(snake_list, block_size)
    message_to_screen('Score: {}'.format(snake_length-1), WHITE)
    
    # 刷新屏幕
    pygame.display.update()
    
    # 设置游戏速度
    clock.tick(20)
 
# 退出游戏
pygame.quit()
quit()

希望对你有所帮助！