使用python编写贪吃蛇小游戏

好的，下面是一个简单的贪吃蛇小游戏的代码实现：

import pygame
import random

# 定义常量
WIDTH = 400
HEIGHT = 400
BLOCK_SIZE = 20

# 初始化pygame
pygame.init()

# 创建游戏窗口
window = pygame.display.set_mode((WIDTH, HEIGHT))
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)
BLUE = (0, 0, 255)

# 定义字体
FONT = pygame.font.SysFont(None, 30)

# 定义Snake类
class Snake:
    def __init__(self):
        self.body = [(WIDTH // 2, HEIGHT // 2)]
        self.direction = random.choice(["left", "right", "up", "down"])
        self.score = 0
    
    def move(self):
        if self.direction == "left":
            new_head = (self.body[0][0] - BLOCK_SIZE, self.body[0][1])
        elif self.direction == "right":
            new_head = (self.body[0][0] + BLOCK_SIZE, self.body[0][1])
        elif self.direction == "up":
            new_head = (self.body[0][0], self.body[0][1] - BLOCK_SIZE)
        elif self.direction == "down":
            new_head = (self.body[0][0], self.body[0][1] + BLOCK_SIZE)
        self.body.insert(0, new_head)
        self.body.pop()
    
    def change_direction(self, new_direction):
        if new_direction == "left" and self.direction != "right":
            self.direction = new_direction
        elif new_direction == "right" and self.direction != "left":
            self.direction = new_direction
        elif new_direction == "up" and self.direction != "down":
            self.direction = new_direction
        elif new_direction == "down" and self.direction != "up":
            self.direction = new_direction
    
    def draw(self):
        for block in self.body:
            pygame.draw.rect(window, GREEN, (block[0], block[1], BLOCK_SIZE, BLOCK_SIZE))
    
    def eat(self, food):
        if self.body[0] == food:
            self.body.append(self.body[-1])
            self.score += 1
            return True
        return False

# 定义Food类
class Food:
    def __init__(self):
        self.position = (random.randint(0, WIDTH // BLOCK_SIZE - 1) * BLOCK_SIZE,
                          random.randint(0, HEIGHT // BLOCK_SIZE - 1) * BLOCK_SIZE)
    
    def draw(self):
        pygame.draw.rect(window, RED, (self.position[0], self.position[1], BLOCK_SIZE, BLOCK_SIZE))

# 创建Snake和Food对象
snake = Snake()
food = Food()

# 定义游戏主循环
clock = pygame.time.Clock()
game_over = False
while not game_over:
    # 处理事件
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            game_over = True
        elif event.type == pygame.KEYDOWN:
            if event.key == pygame.K_LEFT:
                snake.change_direction("left")
            elif event.key == pygame.K_RIGHT:
                snake.change_direction("right")
            elif event.key == pygame.K_UP:
                snake.change_direction("up")
            elif event.key == pygame.K_DOWN:
                snake.change_direction("down")
    
    # 移动Snake
    snake.move()
    
    # 判断是否吃到Food
    if snake.eat(food.position):
        food = Food()
    
    # 绘制游戏界面
    window.fill(BLACK)
    snake.draw()
    food.draw()
    score_text = FONT.render("Score: {}".format(snake.score), True, WHITE)
    window.blit(score_text, (10, 10))
    pygame.display.update()
    
    # 判断是否碰到边界或自身
    if snake.body[0][0] < 0 or snake.body[0][0] >= WIDTH or snake.body[0][1] < 0 or snake.body[0][1] >= HEIGHT:
        game_over = True
    for block in snake.body[1:]:
        if block == snake.body[0]:
            game_over = True
    
    # 控制游戏速度
    clock.tick(10)

# 退出游戏
pygame.quit()

运行以上代码，即可开始游戏。玩家可以使用键盘上的方向键来控制贪吃蛇的移动方向，吃到食物后，贪吃蛇的长度会增加，得分也会增加。如果贪吃蛇碰到边界或自身，则游戏结束。