用python写一个贪吃蛇

好的，下面是一个简单的贪吃蛇游戏的 Python 实现：

import pygame
import random

# 初始化 Pygame
pygame.init()

# 定义窗口大小和标题
window_width = 640
window_height = 480
game_display = pygame.display.set_mode((window_width, window_height))
pygame.display.set_caption('Snake Game')

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

# 定义贪吃蛇和食物大小
snake_block_size = 10
food_block_size = 10

# 定义时钟
clock = pygame.time.Clock()

# 定义字体
font_style = pygame.font.SysFont(None, 30)

# 定义函数，用于显示分数
def display_score(score):
    score_text = font_style.render(f"Score: {score}", True, black)
    game_display.blit(score_text, [0, 0])

# 定义函数，用于画贪吃蛇和食物
def draw_snake_and_food(snake_block_size, snake_list, food_block_size, food_position):
    for block in snake_list:
        pygame.draw.rect(game_display, black, [block[0], block[1], snake_block_size, snake_block_size])
    pygame.draw.rect(game_display, red, [food_position[0], food_position[1], food_block_size, food_block_size])

# 定义函数，用于显示游戏结束信息
def game_over():
    game_over_text = font_style.render("Game Over!", True, black)
    game_display.blit(game_over_text, [window_width/2 - game_over_text.get_width()/2, window_height/2 - game_over_text.get_height()/2])
    pygame.display.update()
    pygame.time.delay(2000)

# 定义函数，用于运行游戏
def run_game():
    # 初始化贪吃蛇位置
    snake_list = []
    snake_length = 1
    x = window_width/2
    y = window_height/2
    x_change = 0
    y_change = 0

    # 初始化食物位置
    food_position = [round(random.randrange(0, window_width - food_block_size) / 10.0) * 10.0, round(random.randrange(0, window_height - food_block_size) / 10.0) * 10.0]

    # 初始化分数
    score = 0

    # 定义游戏是否结束的变量
    game_over = False

    # 游戏主循环
    while not game_over:
        # 处理事件
        for event in pygame.event.get():
            if event.type == pygame.QUIT:
                game_over = True
            elif event.type == pygame.KEYDOWN:
                if event.key == pygame.K_LEFT:
                    x_change = -snake_block_size
                    y_change = 0
                elif event.key == pygame.K_RIGHT:
                    x_change = snake_block_size
                    y_change = 0
                elif event.key == pygame.K_UP:
                    x_change = 0
                    y_change = -snake_block_size
                elif event.key == pygame.K_DOWN:
                    x_change = 0
                    y_change = snake_block_size

        # 移动贪吃蛇
        x += x_change
        y += y_change

        # 判断是否吃到食物
        if x == food_position[0] and y == food_position[1]:
            food_position = [round(random.randrange(0, window_width - food_block_size) / 10.0) * 10.0, round(random.randrange(0, window_height - food_block_size) / 10.0) * 10.0]
            snake_length += 1
            score += 10

        # 更新贪吃蛇列表
        snake_head = []
        snake_head.append(x)
        snake_head.append(y)
        snake_list.append(snake_head)
        if len(snake_list) > snake_length:
            del snake_list[0]

        # 判断是否撞墙或自己
        for block in snake_list[:-1]:
            if block == snake_head:
                game_over = True
        if x < 0 or x >= window_width or y < 0 or y >= window_height:
            game_over = True

        # 绘制游戏画面
        game_display.fill(white)
        draw_snake_and_food(snake_block_size, snake_list, food_block_size, food_position)
        display_score(score)
        pygame.display.update()

        # 控制游戏速度
        clock.tick(20)

    # 显示游戏结束信息
    game_over()
    pygame.quit()
    quit()

# 运行游戏
run_game()

这是一个比较简单的实现，如果需要更加完善的贪吃蛇游戏，可以自行添加更多特性和功能。