写一个贪吃蛇程序，python

好的，下面是一个简单的贪吃蛇程序，使用Python和Pygame库编写：

import pygame
import random

# 初始化Pygame模块
pygame.init()

# 定义游戏窗口大小和游戏区域大小
WINDOW_WIDTH = 800
WINDOW_HEIGHT = 600
CELL_SIZE = 25
GAME_AREA_WIDTH = WINDOW_WIDTH - CELL_SIZE * 2
GAME_AREA_HEIGHT = WINDOW_HEIGHT - CELL_SIZE * 2

# 定义游戏区域的边界
LEFT_BOUNDARY = CELL_SIZE
RIGHT_BOUNDARY = WINDOW_WIDTH - CELL_SIZE
TOP_BOUNDARY = CELL_SIZE
BOTTOM_BOUNDARY = WINDOW_HEIGHT - CELL_SIZE

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

# 创建游戏窗口
window = pygame.display.set_mode((WINDOW_WIDTH, WINDOW_HEIGHT))
pygame.display.set_caption('贪吃蛇')

# 创建时钟对象，用于控制游戏帧率
clock = pygame.time.Clock()

class Snake:
    def __init__(self):
        self.body = [(GAME_AREA_WIDTH // 2, GAME_AREA_HEIGHT // 2)]
        self.direction = 'right'

    def move(self):
        x, y = self.body[0]
        if self.direction == 'up':
            y -= CELL_SIZE
        elif self.direction == 'down':
            y += CELL_SIZE
        elif self.direction == 'left':
            x -= CELL_SIZE
        elif self.direction == 'right':
            x += CELL_SIZE
        self.body.insert(0, (x, y))
        self.body.pop()

    def grow(self):
        x, y = self.body[0]
        if self.direction == 'up':
            y -= CELL_SIZE
        elif self.direction == 'down':
            y += CELL_SIZE
        elif self.direction == 'left':
            x -= CELL_SIZE
        elif self.direction == 'right':
            x += CELL_SIZE
        self.body.insert(0, (x, y))

    def draw(self):
        for x, y in self.body:
            pygame.draw.rect(window, WHITE, (x, y, CELL_SIZE, CELL_SIZE))

class Food:
    def __init__(self):
        self.x = random.randint(LEFT_BOUNDARY // CELL_SIZE + 1, RIGHT_BOUNDARY // CELL_SIZE - 1) * CELL_SIZE
        self.y = random.randint(TOP_BOUNDARY // CELL_SIZE + 1, BOTTOM_BOUNDARY // CELL_SIZE - 1) * CELL_SIZE

    def draw(self):
        pygame.draw.circle(window, RED, (self.x + CELL_SIZE // 2, self.y + CELL_SIZE // 2), CELL_SIZE // 2)

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

# 游戏主循环
while True:
    # 处理游戏事件
    for event in pygame.event.get():
        if event.type == pygame.QUIT:
            pygame.quit()
            exit()
        elif 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'

    # 移动贪吃蛇
    snake.move()

    # 判断是否吃到食物
    if snake.body[0] == (food.x, food.y):
        snake.grow()
        food = Food()

    # 判断是否撞到边界或自己的身体
    if snake.body[0][0] < LEFT_BOUNDARY or snake.body[0][0] >= RIGHT_BOUNDARY or \
            snake.body[0][1] < TOP_BOUNDARY or snake.body[0][1] >= BOTTOM_BOUNDARY or \
            snake.body[0] in snake.body[1:]:
        print('游戏结束！')
        pygame.quit()
        exit()

    # 绘制游戏界面
    window.fill(BLACK)
    snake.draw()
    food.draw()
    pygame.draw.rect(window, WHITE, (LEFT_BOUNDARY, TOP_BOUNDARY, GAME_AREA_WIDTH, GAME_AREA_HEIGHT), 1)
    pygame.display.update()

    # 控制游戏帧率
    clock.tick(10)

运行程序后，会弹出一个窗口，按照方向键控制贪吃蛇的移动。吃到食物会增加蛇身的长度，撞到边界或自己的身体则游戏结束。