写一个贪吃蛇游戏 完整代码

以下是 Python 3 的贪吃蛇游戏完整代码：

import pygame
import random

# 初始化 Pygame
pygame.init()

# 游戏窗口大小
WINDOW_WIDTH = 800
WINDOW_HEIGHT = 600

# 贪吃蛇方块大小
SNAKE_BLOCK_SIZE = 20

# 设置颜色
BLACK = (0, 0, 0)
WHITE = (255, 255, 255)
RED = (255, 0, 0)
GREEN = (0, 255, 0)

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

# 创建一个计时器对象
clock = pygame.time.Clock()

# 定义一个函数来绘制贪吃蛇
def draw_snake(snake_list):
    for block in snake_list:
        pygame.draw.rect(window, GREEN, [block[0], block[1], SNAKE_BLOCK_SIZE, SNAKE_BLOCK_SIZE])

# 游戏循环
def game_loop():
    # 初始化贪吃蛇位置和长度
    snake_head = [WINDOW_WIDTH // 2, WINDOW_HEIGHT // 2]
    snake_list = [snake_head]
    snake_length = 1

    # 初始化食物位置
    food_x = round(random.randrange(0, WINDOW_WIDTH - SNAKE_BLOCK_SIZE) / 20.0) * 20.0
    food_y = round(random.randrange(0, WINDOW_HEIGHT - SNAKE_BLOCK_SIZE) / 20.0) * 20.0

    # 初始化贪吃蛇移动方向
    direction = 'RIGHT'

    # 游戏是否结束的标志
    game_over = False

    # 游戏主循环
    while not game_over:
        # 处理事件
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                # 点击了关闭按钮
                game_over = True
            elif event.type == pygame.KEYDOWN:
                if event.key == pygame.K_LEFT and direction != 'RIGHT':
                    direction = 'LEFT'
                elif event.key == pygame.K_RIGHT and direction != 'LEFT':
                    direction = 'RIGHT'
                elif event.key == pygame.K_UP and direction != 'DOWN':
                    direction = 'UP'
                elif event.key == pygame.K_DOWN and direction != 'UP':
                    direction = 'DOWN'

        # 移动贪吃蛇
        if direction == 'LEFT':
            snake_head[0] -= SNAKE_BLOCK_SIZE
        elif direction == 'RIGHT':
            snake_head[0] += SNAKE_BLOCK_SIZE
        elif direction == 'UP':
            snake_head[1] -= SNAKE_BLOCK_SIZE
        elif direction == 'DOWN':
            snake_head[1] += SNAKE_BLOCK_SIZE

        # 判断是否吃到食物
        if snake_head[0] == food_x and snake_head[1] == food_y:
            # 生成新的食物位置
            food_x = round(random.randrange(0, WINDOW_WIDTH - SNAKE_BLOCK_SIZE) / 20.0) * 20.0
            food_y = round(random.randrange(0, WINDOW_HEIGHT - SNAKE_BLOCK_SIZE) / 20.0) * 20.0

            # 增加贪吃蛇长度
            snake_length += 1

        # 添加贪吃蛇头部到列表中
        snake_list.append(list(snake_head))

        # 如果贪吃蛇长度大于规定长度，则删除列表中最早加入的元素
        if len(snake_list) > snake_length:
            del snake_list[0]

        # 检查是否撞到墙或者自己
        for block in snake_list[:-1]:
            if block == snake_head:
                game_over = True
        if snake_head[0] < 0 or snake_head[0] >= WINDOW_WIDTH or snake_head[1] < 0 or snake_head[1] >= WINDOW_HEIGHT:
            game_over = True

        # 绘制游戏窗口
        window.fill(BLACK)
        pygame.draw.rect(window, RED, [food_x, food_y, SNAKE_BLOCK_SIZE, SNAKE_BLOCK_SIZE])
        draw_snake(snake_list)
        pygame.display.update()

        # 设置游戏帧率
        clock.tick(10)

    # 退出 Pygame
    pygame.quit()

# 开始游戏循环
game_loop()

注：本代码仅供参考，如有需要，请自行修改和完善。