贪吃蛇python代码

以下是一个简单的贪吃蛇Python代码示例：

import pygame
import random

# 初始化 Pygame 库
pygame.init()

# 定义常量
SCREEN_WIDTH = 600
SCREEN_HEIGHT = 600
BLOCK_SIZE = 20
FONT_SIZE = 30
FPS = 10

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

# 设置屏幕
screen = pygame.display.set_mode((SCREEN_WIDTH, SCREEN_HEIGHT))
pygame.display.set_caption("贪吃蛇")

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

# 定义蛇的类
class Snake:
    def __init__(self):
        self.x = SCREEN_WIDTH // 2
        self.y = SCREEN_HEIGHT // 2
        self.direction = "right"
        self.body = [(self.x, self.y), (self.x - BLOCK_SIZE, self.y), (self.x - BLOCK_SIZE * 2, self.y)]

    # 移动蛇
    def move(self):
        if self.direction == "right":
            self.x += BLOCK_SIZE
        elif self.direction == "left":
            self.x -= BLOCK_SIZE
        elif self.direction == "up":
            self.y -= BLOCK_SIZE
        elif self.direction == "down":
            self.y += BLOCK_SIZE
        self.body.insert(0, (self.x, self.y))
        self.body.pop()

    # 改变蛇的方向
    def change_direction(self, direction):
        if (direction == "right" and self.direction != "left") or \
           (direction == "left" and self.direction != "right") or \
           (direction == "up" and self.direction != "down") or \
           (direction == "down" and self.direction != "up"):
            self.direction = direction

    # 检测蛇是否撞墙或者撞到自己
    def check_collision(self):
        if self.x < 0 or self.x >= SCREEN_WIDTH or \
           self.y < 0 or self.y >= SCREEN_HEIGHT or \
           (self.x, self.y) in self.body[1:]:
            return True
        return False

    # 检测蛇是否吃到食物
    def check_food(self, food):
        if self.x == food.x and self.y == food.y:
            self.body.insert(0, (self.x, self.y))
            return True
        return False

    # 绘制蛇
    def draw(self):
        for x, y in self.body:
            pygame.draw.rect(screen, GREEN, [x, y, BLOCK_SIZE, BLOCK_SIZE])

# 定义食物的类
class Food:
    def __init__(self):
        self.x = random.randint(0, SCREEN_WIDTH // BLOCK_SIZE - 1) * BLOCK_SIZE
        self.y = random.randint(0, SCREEN_HEIGHT // BLOCK_SIZE - 1) * BLOCK_SIZE

    # 绘制食物
    def draw(self):
        pygame.draw.rect(screen, RED, [self.x, self.y, BLOCK_SIZE, BLOCK_SIZE])

# 创建蛇和食物对象
snake = Snake()
food = Food()

# 设置游戏时钟
clock = pygame.time.Clock()

# 游戏循环
while True:
    # 处理事件
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            pygame.quit()
            quit()
        elif event.type == pygame.KEYDOWN:
            if event.key == pygame.K_RIGHT:
                snake.change_direction("right")
            elif event.key == pygame.K_LEFT:
                snake.change_direction("left")
            elif event.key == pygame.K_UP:
                snake.change_direction("up")
            elif event.key == pygame.K_DOWN:
                snake.change_direction("down")

    # 移动蛇
    snake.move()

    # 检测蛇是否吃到食物
    if snake.check_food(food):
        food = Food()

    # 绘制背景
    screen.fill(BLACK)

    # 绘制蛇和食物
    snake.draw()
    food.draw()

    # 检测蛇是否撞墙或者撞到自己
    if snake.check_collision():
        text = font.render("GAME OVER", True, WHITE)
        screen.blit(text, ((SCREEN_WIDTH - text.get_width()) // 2, (SCREEN_HEIGHT - text.get_height()) // 2))
        pygame.display.update()
        pygame.time.wait(2000)
        pygame.quit()
        quit()

    # 更新屏幕
    pygame.display.update()

    # 控制帧率
    clock.tick(FPS)

以上代码仅供参考，还有很多细节需要完善。