写个贪吃蛇python代码

以下是一个简单的贪吃蛇Python代码：

import pygame
import random

# 初始化pygame
pygame.init()

# 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))

# 设置游戏标题
pygame.display.set_caption('贪吃蛇')

# 定义游戏颜色
white = (255, 255, 255)
black = (0, 0, 0)
red = (255, 0, 0)
green = (0, 255, 0)

# 定义贪吃蛇的大小和速度
snake_block_size = 10
snake_speed = 15

# 创建字体对象
font_style = pygame.font.SysFont(None, 30)

# 定义显示分数的函数
def show_score(score):
    score_text = font_style.render("Score: " + str(score), True, black)
    game_display.blit(score_text, [0, 0])

# 定义绘制贪吃蛇的函数
def draw_snake(snake_block_size, snake_list):
    for x in snake_list:
        pygame.draw.rect(game_display, green, [x[0], x[1], snake_block_size, snake_block_size])

# 游戏主函数
def game_loop():
    # 初始贪吃蛇的位置和长度
    snake_position_x = window_width / 2
    snake_position_y = window_height / 2
    snake_length = 1
    snake_list = []
    # 初始食物的位置
    food_position_x = round(random.randrange(0, window_width - snake_block_size) / 10.0) * 10.0
    food_position_y = round(random.randrange(0, window_height - snake_block_size) / 10.0) * 10.0
    # 定义初始方向
    direction = "right"

    # 游戏结束标志
    game_over = False

    # 游戏分数
    score = 0

    # 游戏循环
    while not game_over:
        # 处理事件
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                game_over = True
            if event.type == pygame.KEYDOWN:
                if event.key == pygame.K_LEFT:
                    direction = "left"
                elif event.key == pygame.K_RIGHT:
                    direction = "right"
                elif event.key == pygame.K_UP:
                    direction = "up"
                elif event.key == pygame.K_DOWN:
                    direction = "down"

        # 根据方向移动贪吃蛇头部
        if direction == "right":
            snake_position_x += snake_block_size
        elif direction == "left":
            snake_position_x -= snake_block_size
        elif direction == "up":
            snake_position_y -= snake_block_size
        elif direction == "down":
            snake_position_y += snake_block_size

        # 判断贪吃蛇是否撞墙
        if snake_position_x >= window_width or snake_position_x < 0 or snake_position_y >= window_height or snake_position_y < 0:
            game_over = True

        # 判断贪吃蛇是否吃到食物
        if snake_position_x == food_position_x and snake_position_y == food_position_y:
            food_position_x = round(random.randrange(0, window_width - snake_block_size) / 10.0) * 10.0
            food_position_y = round(random.randrange(0, window_height - snake_block_size) / 10.0) * 10.0
            snake_length += 1
            score += 10

        # 绘制游戏背景
        game_display.fill(white)

        # 绘制食物
        pygame.draw.rect(game_display, red, [food_position_x, food_position_y, snake_block_size, snake_block_size])

        # 将贪吃蛇头部的位置加入贪吃蛇列表中
        snake_head = []
        snake_head.append(snake_position_x)
        snake_head.append(snake_position_y)
        snake_list.append(snake_head)

        # 如果贪吃蛇长度大于限制，删除贪吃蛇尾部的位置
        if len(snake_list) > snake_length:
            del snake_list[0]

        # 判断贪吃蛇是否撞到自己
        for x in snake_list[:-1]:
            if x == snake_head:
                game_over = True

        # 绘制贪吃蛇
        draw_snake(snake_block_size, snake_list)

        # 显示分数
        show_score(score)

        # 更新游戏窗口
        pygame.display.update()

        # 设置游戏速度
        clock = pygame.time.Clock()
        clock.tick(snake_speed)

    # 退出pygame
    pygame.quit()

# 运行游戏
game_loop()

运行上述代码后，将会显示一个简单的贪吃蛇游戏界面。通过上、下、左、右键来控制贪吃蛇的移动，吃到食物会得到10分，撞墙或撞到自己会结束游戏。