帮我写一个贪吃蛇游戏

好的，下面是一个简单的贪吃蛇游戏的Python代码示例：

import pygame
import random

# 初始化 Pygame
pygame.init()

# 游戏窗口的尺寸和标题
WINDOW_WIDTH = 640
WINDOW_HEIGHT = 480
WINDOW_TITLE = '贪吃蛇'

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

# 创建游戏窗口
window = pygame.display.set_mode((WINDOW_WIDTH, WINDOW_HEIGHT))
pygame.display.set_caption(WINDOW_TITLE)

# 设置游戏时钟
clock = pygame.time.Clock()

# 定义贪吃蛇的初始位置和大小
snake_x = 100
snake_y = 100
snake_size = 20

# 定义贪吃蛇每一节的大小
snake_block_size = 20

# 定义贪吃蛇的移动速度
snake_speed = 5

# 定义食物的初始位置和大小
food_x = random.randrange(0, WINDOW_WIDTH - snake_size, snake_block_size)
food_y = random.randrange(0, WINDOW_HEIGHT - snake_size, snake_block_size)
food_size = 20

# 定义贪吃蛇的初始方向
snake_direction = 'right'

# 定义贪吃蛇的初始长度和身体
snake_length = 1
snake_body = []

# 定义游戏结束标志
game_over = False

# 游戏循环
while not game_over:

    # 处理游戏事件
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            game_over = True

    # 处理方向控制
    keys = pygame.key.get_pressed()
    if keys[pygame.K_LEFT] and snake_direction != 'right':
        snake_direction = 'left'
    elif keys[pygame.K_RIGHT] and snake_direction != 'left':
        snake_direction = 'right'
    elif keys[pygame.K_UP] and snake_direction != 'down':
        snake_direction = 'up'
    elif keys[pygame.K_DOWN] and snake_direction != 'up':
        snake_direction = 'down'

    # 根据方向移动贪吃蛇的头部
    if snake_direction == 'left':
        snake_x -= snake_speed
    elif snake_direction == 'right':
        snake_x += snake_speed
    elif snake_direction == 'up':
        snake_y -= snake_speed
    elif snake_direction == 'down':
        snake_y += snake_speed

    # 判断贪吃蛇是否吃到了食物
    if snake_x == food_x and snake_y == food_y:
        food_x = random.randrange(0, WINDOW_WIDTH - snake_size, snake_block_size)
        food_y = random.randrange(0, WINDOW_HEIGHT - snake_size, snake_block_size)
        snake_length += 1

    # 绘制游戏界面
    window.fill(BLACK)
    pygame.draw.rect(window, GREEN, (food_x, food_y, food_size, food_size))

    snake_head = []
    snake_head.append(snake_x)
    snake_head.append(snake_y)
    snake_body.append(snake_head)

    if len(snake_body) > snake_length:
        del snake_body[0]

    for block in snake_body:
        pygame.draw.rect(window, WHITE, (block[0], block[1], snake_block_size, snake_block_size))

    # 判断贪吃蛇是否碰到了边界或自己的身体
    if snake_x < 0 or snake_x >= WINDOW_WIDTH or snake_y < 0 or snake_y >= WINDOW_HEIGHT:
        game_over = True

    for block in snake_body[:-1]:
        if block == snake_head:
            game_over = True

    pygame.display.update()

    # 控制游戏的帧率
    clock.tick(30)

# 退出 Pygame
pygame.quit()

该代码使用 Pygame 库实现了一个简单的贪吃蛇游戏，界面使用黑色背景和白色方块代表贪吃蛇的身体，绿色方块代表食物。贪吃蛇的移动方向由方向键控制，当贪吃蛇吃到食物时，贪吃蛇的长度会增加。游戏结束的条件为贪吃蛇碰到边界或自己的身体。