编写出一款贪吃蛇的代码

编写贪吃蛇的代码需要使用图形化界面，可以使用Python中的Pygame模块来实现。下面是一个简单的贪吃蛇代码示例：

import pygame
import random

# 初始化Pygame
pygame.init()

# 定义颜色变量
white = (255, 255, 255)
black = (0, 0, 0)
red = (255, 0, 0)

# 定义游戏窗口大小
window_width = 800
window_height = 600

# 创建游戏窗口
game_display = pygame.display.set_mode((window_width, window_height))
pygame.display.set_caption('Snake Game')

# 定义贪吃蛇大小
block_size = 10

# 定义时钟对象
clock = pygame.time.Clock()

# 定义字体对象
font = pygame.font.SysFont(None, 25)

def message_to_screen(msg, color):
    screen_text = font.render(msg, True, color)
    game_display.blit(screen_text, [window_width/2, window_height/2])

def gameLoop():
    # 定义游戏结束变量
    game_exit = False
    game_over = False

    # 初始化贪吃蛇位置和速度
    lead_x = window_width/2
    lead_y = window_height/2
    lead_x_change = 0
    lead_y_change = 0

    # 初始化食物位置
    rand_food_x = round(random.randrange(0, window_width - block_size) / float(block_size)) * float(block_size)
    rand_food_y = round(random.randrange(0, window_height - block_size) / float(block_size)) * float(block_size)

    while not game_exit:

        while game_over == True:
            game_display.fill(white)
            message_to_screen("Game over, press Q to quit or C to play again", red)
            pygame.display.update()

            for event in pygame.event.get():
                if event.type == pygame.KEYDOWN:
                    if event.key == pygame.K_q:
                        game_exit = True
                        game_over = False
                    if event.key == pygame.K_c:
                        gameLoop()

        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                game_exit = True
            if event.type == pygame.KEYDOWN:
                if event.key == pygame.K_LEFT:
                    lead_x_change = -block_size
                    lead_y_change = 0
                elif event.key == pygame.K_RIGHT:
                    lead_x_change = block_size
                    lead_y_change = 0
                elif event.key == pygame.K_UP:
                    lead_y_change = -block_size
                    lead_x_change = 0
                elif event.key == pygame.K_DOWN:
                    lead_y_change = block_size
                    lead_x_change = 0

        # 判断是否撞到边界或者自身
        if lead_x >= window_width or lead_x < 0 or lead_y >= window_height or lead_y < 0:
            game_over = True

        # 更新贪吃蛇位置
        lead_x += lead_x_change
        lead_y += lead_y_change

        # 绘制游戏窗口背景和食物
        game_display.fill(white)
        pygame.draw.rect(game_display, red, [rand_food_x, rand_food_y, block_size, block_size])
        pygame.draw.rect(game_display, black, [lead_x, lead_y, block_size, block_size])
        pygame.display.update()

        # 判断是否吃到食物
        if lead_x == rand_food_x and lead_y == rand_food_y:
            rand_food_x = round(random.randrange(0, window_width - block_size) / float(block_size)) * float(block_size)
            rand_food_y = round(random.randrange(0, window_height - block_size) / float(block_size)) * float(block_size)

        # 控制游戏帧率
        clock.tick(10)

    # 关闭Pygame
    pygame.quit()
    quit()

gameLoop()

上面代码中，我们使用Pygame实现了一个简单的贪吃蛇游戏。游戏中，我们使用方向键控制贪吃蛇的移动，贪吃蛇吃到食物后会增加长度，如果贪吃蛇撞到边界或者自身，则游戏结束。