用python编写一个贪吃蛇游戏

好的，下面是一个简单的 Python 贪吃蛇游戏：

import pygame
import random

# 初始化 Pygame
pygame.init()

# 定义一些常量
SCREEN_WIDTH = 600
SCREEN_HEIGHT = 600
BLOCK_SIZE = 20
APPLE_SIZE = 20
SNAKE_COLOR = (0, 255, 0)
APPLE_COLOR = (255, 0, 0)

# 创建游戏窗口
screen = pygame.display.set_mode((SCREEN_WIDTH, SCREEN_HEIGHT))
pygame.display.set_caption('贪吃蛇')

# 定义蛇的初始位置和长度
snake = [(SCREEN_WIDTH / 2, SCREEN_HEIGHT / 2)]
snake_direction = 'right'
snake_length = 1

# 定义苹果的位置
apple = (random.randint(0, SCREEN_WIDTH / BLOCK_SIZE - 1) * BLOCK_SIZE,
         random.randint(0, SCREEN_HEIGHT / BLOCK_SIZE - 1) * BLOCK_SIZE)

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

        if event.type == pygame.KEYDOWN:
            if event.key == pygame.K_UP and snake_direction != 'down':
                snake_direction = 'up'
            elif event.key == pygame.K_DOWN and snake_direction != 'up':
                snake_direction = 'down'
            elif event.key == pygame.K_LEFT and snake_direction != 'right':
                snake_direction = 'left'
            elif event.key == pygame.K_RIGHT and snake_direction != 'left':
                snake_direction = 'right'

    # 根据蛇的方向移动蛇头
    if snake_direction == 'up':
        snake_head = (snake[0][0], snake[0][1] - BLOCK_SIZE)
    elif snake_direction == 'down':
        snake_head = (snake[0][0], snake[0][1] + BLOCK_SIZE)
    elif snake_direction == 'left':
        snake_head = (snake[0][0] - BLOCK_SIZE, snake[0][1])
    else:
        snake_head = (snake[0][0] + BLOCK_SIZE, snake[0][1])

    # 将蛇头加入蛇身
    snake.insert(0, snake_head)

    # 如果蛇头碰到边界或者碰到自己的身体，游戏结束
    if snake_head[0] < 0 or snake_head[0] >= SCREEN_WIDTH or \
       snake_head[1] < 0 or snake_head[1] >= SCREEN_HEIGHT or \
       snake_head in snake[1:]:
        pygame.quit()
        quit()

    # 如果蛇头碰到苹果，蛇长度加 1，重新生成苹果位置
    if snake_head == apple:
        snake_length += 1
        apple = (random.randint(0, SCREEN_WIDTH / BLOCK_SIZE - 1) * BLOCK_SIZE,
                 random.randint(0, SCREEN_HEIGHT / BLOCK_SIZE - 1) * BLOCK_SIZE)

    # 如果蛇长度超过了 snake_length，就删掉蛇尾
    if len(snake) > snake_length:
        snake.pop()

    # 绘制游戏界面
    screen.fill((0, 0, 0))

    # 绘制蛇
    for block in snake:
        pygame.draw.rect(screen, SNAKE_COLOR, (block[0], block[1], BLOCK_SIZE, BLOCK_SIZE))

    # 绘制苹果
    pygame.draw.rect(screen, APPLE_COLOR, (apple[0], apple[1], APPLE_SIZE, APPLE_SIZE))

    # 刷新界面
    pygame.display.update()

    # 控制游戏帧率
    pygame.time.Clock().tick(10)

这个游戏相对比较简单，如果你想让游戏更有趣，可以添加一些特殊的道具或者障碍物。