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()

# 游戏区域的宽度和高度
width = 640
height = 480

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

# 创建游戏窗口
screen = pygame.display.set_mode((width, height))
pygame.display.set_caption('贪吃蛇')

# 蛇的尺寸
snake_size = 10

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

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

# 显示游戏分数的函数
def show_score(score):
    score_text = font.render("Score: " + str(score), True, white)
    screen.blit(score_text, [0, 0])

# 绘制蛇的函数
def draw_snake(snake_list):
    for x in snake_list:
        pygame.draw.rect(screen, black, [x[0], x[1], snake_size, snake_size])

# 主函数
def game():
    # 定义蛇的初始位置和长度
    snake_pos = [width / 2, height / 2]
    snake_list = [snake_pos]
    snake_len = 1

    # 定义食物的初始位置
    food_pos = [random.randrange(0, width - snake_size), random.randrange(0, height - snake_size)]
    food_spawned = True

    # 定义蛇的移动方向
    direction = 'RIGHT'
    change_to = direction

    # 定义游戏分数
    score = 0

    # 游戏循环
    game_over = False
    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_RIGHT:
                    change_to = 'RIGHT'
                elif event.key == pygame.K_LEFT:
                    change_to = 'LEFT'
                elif event.key == pygame.K_UP:
                    change_to = 'UP'
                elif event.key == pygame.K_DOWN:
                    change_to = 'DOWN'

        # 改变蛇的移动方向
        if change_to == 'RIGHT' and direction != 'LEFT':
            direction = 'RIGHT'
        elif change_to == 'LEFT' and direction != 'RIGHT':
            direction = 'LEFT'
        elif change_to == 'UP' and direction != 'DOWN':
            direction = 'UP'
        elif change_to == 'DOWN' and direction != 'UP':
            direction = 'DOWN'

        # 移动蛇的位置
        if direction == 'RIGHT':
            snake_pos[0] += snake_size
        elif direction == 'LEFT':
            snake_pos[0] -= snake_size
        elif direction == 'UP':
            snake_pos[1] -= snake_size
        elif direction == 'DOWN':
            snake_pos[1] += snake_size

        # 判断蛇是否吃到食物
        if snake_pos == food_pos:
            food_spawned = False
            snake_len += 1
            score += 10

        # 创建新的食物
        if not food_spawned:
            food_pos = [random.randrange(0, width - snake_size), random.randrange(0, height - snake_size)]
            food_spawned = True

        # 绘制游戏界面
        screen.fill(black)
        pygame.draw.rect(screen, red, [food_pos[0], food_pos[1], snake_size, snake_size])
        snake_head = []
        snake_head.append(snake_pos[0])
        snake_head.append(snake_pos[1])
        snake_list.append(snake_head)
        if len(snake_list) > snake_len:
            del snake_list[0]

        for x in snake_list[:-1]:
            if x == snake_head:
                game_over = True

        draw_snake(snake_list)
        show_score(score)
        pygame.display.update()

        # 控制游戏帧率
        clock.tick(15)

    # 退出游戏
    pygame.quit()
    quit()

# 启动游戏
game()

运行代码后，就可以开始玩贪吃蛇游戏了。通过方向键控制蛇的移动方向，吃到食物可以增加分数。当蛇碰到墙壁或自己时，游戏结束。