用python写一个贪吃蛇小游戏的代码，我自己可以玩的那种

好的，以下是一个简单的贪吃蛇小游戏的 Python 代码。这个游戏使用 Pygame 模块来实现游戏画面的绘制。

import pygame
import random

# 初始化 Pygame
pygame.init()

# 设置游戏窗口尺寸
WINDOW_WIDTH = 640
WINDOW_HEIGHT = 480
WINDOW_SIZE = (WINDOW_WIDTH, WINDOW_HEIGHT)

# 创建游戏窗口
screen = pygame.display.set_mode(WINDOW_SIZE)

# 设置游戏标题
pygame.display.set_caption('Snake Game')

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

# 定义游戏参数
CELL_SIZE = 20
SPEED = 5

# 定义蛇的初始位置和大小
snake_x = 100
snake_y = 100
snake_length = 3

# 定义蛇的初始移动方向
direction = 'right'

# 定义食物的初始位置
food_x = random.randrange(0, WINDOW_WIDTH, CELL_SIZE)
food_y = random.randrange(0, WINDOW_HEIGHT, CELL_SIZE)

# 定义计分板
score = 0
font = pygame.font.SysFont(None, 30)

# 定义游戏结束的函数
def game_over():
    game_over_font = pygame.font.SysFont(None, 80)
    game_over_text = game_over_font.render('Game Over', True, RED)
    screen.blit(game_over_text, (WINDOW_WIDTH / 2 - game_over_text.get_width() / 2, WINDOW_HEIGHT / 2 - game_over_text.get_height() / 2))
    pygame.display.update()
    pygame.time.wait(2000)
    pygame.quit()
    quit()

# 定义游戏主循环
while True:
    # 处理游戏事件
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            pygame.quit()
            quit()

        # 处理按键事件
        if event.type == pygame.KEYDOWN:
            if event.key == pygame.K_LEFT:
                direction = 'left'
            elif event.key == pygame.K_RIGHT:
                direction = 'right'
            elif event.key == pygame.K_UP:
                direction = 'up'
            elif event.key == pygame.K_DOWN:
                direction = 'down'

    # 移动蛇的位置
    if direction == 'left':
        snake_x -= CELL_SIZE
    elif direction == 'right':
        snake_x += CELL_SIZE
    elif direction == 'up':
        snake_y -= CELL_SIZE
    elif direction == 'down':
        snake_y += CELL_SIZE

    # 检查蛇是否碰到边界
    if snake_x < 0 or snake_x >= WINDOW_WIDTH or snake_y < 0 or snake_y >= WINDOW_HEIGHT:
        game_over()

    # 检查蛇是否碰到自己
    snake_head = [snake_x, snake_y]
    snake_body = [[snake_x, snake_y]]
    for i in range(snake_length - 1):
        snake_body.append([snake_x - CELL_SIZE * (i + 1), snake_y])
    if snake_head in snake_body[1:]:
        game_over()

    # 检查蛇是否