python实现贪吃蛇游戏

好的，下面是一个简单的贪吃蛇游戏的 Python 实现：

import pygame
import random

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

# 设置窗口大小
SCREEN_WIDTH = 800
SCREEN_HEIGHT = 600

# 设置方格大小
BLOCK_SIZE = 20

# 初始化 Pygame
pygame.init()

# 创建窗口
screen = pygame.display.set_mode([SCREEN_WIDTH, SCREEN_HEIGHT])

# 设置窗口标题
pygame.display.set_caption('贪吃蛇')

# 设置游戏时钟
clock = pygame.time.Clock()

# 定义贪吃蛇类
class Snake():
    def __init__(self):
        self.length = 1
        self.positions = [(SCREEN_WIDTH / 2, SCREEN_HEIGHT / 2)]
        self.direction = random.choice([UP, DOWN, LEFT, RIGHT])
        self.color = GREEN

    def get_head_position(self):
        return self.positions[0]

    def turn(self, point):
        if self.length > 1 and (point[0]*-1, point[1]*-1) == self.direction:
            return
        else:
            self.direction = point

    def move(self):
        cur = self.get_head_position()
        x, y = self.direction
        new = ((cur[0] + (x*BLOCK_SIZE)), (cur[1] + (y*BLOCK_SIZE)))
        if new in self.positions[2:]:
            self.reset()
        else:
            self.positions.insert(0, new)
            if len(self.positions) > self.length:
                self.positions.pop()

    def reset(self):
        self.length = 1
        self.positions = [(SCREEN_WIDTH / 2, SCREEN_HEIGHT / 2)]
        self.direction = random.choice([UP, DOWN, LEFT, RIGHT])

    def draw(self, surface):
        for p in self.positions:
            r = pygame.Rect((p[0], p[1]), (BLOCK_SIZE, BLOCK_SIZE))
            pygame.draw.rect(surface, self.color, r)
            pygame.draw.rect(surface, BLACK, r, 1)

# 定义食物类
class Food():
    def __init__(self):
        x = random.randrange(0, SCREEN_WIDTH, BLOCK_SIZE)
        y = random.randrange(0, SCREEN_HEIGHT, BLOCK_SIZE)
        self.position = (x, y)
        self.color = RED

    def draw(self, surface):
        r = pygame.Rect((self.position[0], self.position[1]), (BLOCK_SIZE, BLOCK_SIZE))
        pygame.draw.rect(surface, self.color, r)
        pygame.draw.rect(surface, BLACK, r, 1)

# 定义方向常量
UP = (0, -1)
DOWN = (0, 1)
LEFT = (-1, 0)
RIGHT = (1, 0)

# 创建贪吃蛇和食物对象
snake = Snake()
food = Food()

# 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_UP:
                snake.turn(UP)
            elif event.key == pygame.K_DOWN:
                snake.turn(DOWN)
            elif event.key == pygame.K_LEFT:
                snake.turn(LEFT)
            elif event.key == pygame.K_RIGHT:
                snake.turn(RIGHT)

    # 移动贪吃蛇
    snake.move()

    # 判断是否吃到食物
    if snake.get_head_position() == food.position:
        snake.length += 1
        food = Food()

    # 绘制游戏画面
    screen.fill(WHITE)
    snake.draw(screen)
    food.draw(screen)
    pygame.display.update()

    # 控制游戏帧率
    clock.tick(15)

这个代码实现了一个基本的贪吃蛇游戏，玩家可以通过方向键控制贪吃蛇的移动，吃到食物后贪吃蛇的长度会增加。