用pygame写个带有开始和结束的贪吃蛇小游戏

好的，下面是使用pygame写的带有开始和结束的贪吃蛇小游戏的示例代码：

import pygame
import random
import sys

# 初始化pygame
pygame.init()

# 设置游戏窗口大小和标题
size = (640, 480)
screen = pygame.display.set_mode(size)
pygame.display.set_caption("贪吃蛇")

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

# 定义贪吃蛇的初始位置和大小
snake = [(320, 240), (310, 240), (300, 240)]
snake_size = 10

# 定义食物的初始位置
food = (random.randint(0, 63) * 10, random.randint(0, 47) * 10)

# 定义贪吃蛇的移动方向
direction = "RIGHT"

# 定义计分板的初始得分
score = 0

# 加载游戏需要用到的字体
font = pygame.font.SysFont("arial", 20)

# 加载游戏需要用到的音效
eat_sound = pygame.mixer.Sound("eat.wav")
gameover_sound = pygame.mixer.Sound("gameover.wav")

# 加载游戏需要用到的图片
bg_img = pygame.image.load("bg.png")
snake_img = pygame.image.load("snake.png")
food_img = pygame.image.load("food.png")

# 开始游戏
def start_game():
    global snake, food, direction, score
    snake = [(320, 240), (310, 240), (300, 240)]
    food = (random.randint(0, 63) * 10, random.randint(0, 47) * 10)
    direction = "RIGHT"
    score = 0

# 游戏结束
def game_over():
    global snake, food, direction, score
    snake = []
    food = ()
    direction = ""
    score_text = font.render("得分：" + str(score), True, WHITE)
    screen.blit(score_text, (280, 200))
    gameover_text = font.render("游戏结束！", True, WHITE)
    screen.blit(gameover_text, (270, 230))
    pygame.display.update()
    pygame.time.delay(2000)
    start_game()

# 进入游戏主循环
while True:
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            pygame.quit()
            sys.exit()
        elif event.type == pygame.KEYDOWN:
            if event.key == pygame.K_SPACE:
                start_game()

    # 更新贪吃蛇的位置
    head = snake[0]
    if direction == "RIGHT":
        new_head = (head[0] + snake_size, head[1])
    elif direction == "LEFT":
        new_head = (head[0] - snake_size, head[1])
    elif direction == "UP":
        new_head = (head[0], head[1] - snake_size)
    elif direction == "DOWN":
        new_head = (head[0], head[1] + snake_size)
    snake.insert(0, new_head)
    snake.pop()

    # 判断是否吃到了食物
    if new_head == food:
        eat_sound.play()
        snake.append(snake[-1])
        food = (random.randint(0, 63) * 10, random.randint(0, 47) * 10)
        score += 10

    # 判断是否撞墙或撞到自己
    if new_head[0] < 0 or new_head[0] > 630 or new_head[1] < 0 or new_head[1] > 470 or new_head in snake[1:]:
        gameover_sound.play()
        game_over()

    # 绘制游戏界面
    screen.blit(bg_img, (0, 0))
    screen.blit(food_img, food)
    for pos in snake:
        screen.blit(snake_img, pos)
    score_text = font.render("得分：" + str(score), True, WHITE)
    screen.blit(score_text, (10, 10))
    pygame.display.update()

    # 处理键盘事件
    keys = pygame.key.get_pressed()
    if keys[pygame.K_RIGHT] and direction != "LEFT":
        direction = "RIGHT"
    elif keys[pygame.K_LEFT] and direction != "RIGHT":
        direction = "LEFT"
    elif keys[pygame.K_UP] and direction != "DOWN":
        direction = "UP"
    elif keys[pygame.K_DOWN] and direction != "UP":
        direction = "DOWN"

在运行这段代码之前，你需要先准备好以下文件：

- `bg.png`：游戏背景图片
- `snake.png`：贪吃蛇图片
- `food.png`：食物图片
- `eat.wav`：吃到食物的音效
- `gameover.wav`：游戏结束的音效

这些文件需要和代码文件放在同一个目录下。你也可以根据需要修改这些文件的名称和路径。