使用python写一个贪吃蛇小游戏

好的，下面是一个简易的贪吃蛇小游戏代码，供参考：

import pygame
import random

# 初始化
pygame.init()

# 设置窗口大小
window_width = 800
window_height = 600
window = pygame.display.set_mode((window_width, window_height))

# 设置标题
pygame.display.set_caption("Greedy Snake Game")

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

# 设置字体
font_style = pygame.font.SysFont(None, 50)

# 定义蛇的大小和速度
snake_size = 10
snake_speed = 15

# 定义函数：显示分数
def show_score(score):
    score_text = font_style.render("Score: " + str(score), True, white)
    window.blit(score_text, [0, 0])

# 定义函数：画蛇
def draw_snake(snake_size, snake_list):
    for x in snake_list:
        pygame.draw.rect(window, green, [x[0], x[1], snake_size, snake_size])

# 定义主函数
def main():
    # 初始化蛇的位置和长度
    x1 = window_width / 2
    y1 = window_height / 2
    x1_change = 0
    y1_change = 0
    snake_list = []
    length_of_snake = 1

    # 初始化食物的位置
    foodx = round(random.randrange(0, window_width - snake_size) / 10.0) * 10.0
    foody = round(random.randrange(0, window_height - snake_size) / 10.0) * 10.0

    # 初始化分数
    score = 0

    # 游戏循环
    game_over = False
    while not game_over:
        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:
                    x1_change = -snake_size
                    y1_change = 0
                elif event.key == pygame.K_RIGHT:
                    x1_change = snake_size
                    y1_change = 0
                elif event.key == pygame.K_UP:
                    y1_change = -snake_size
                    x1_change = 0
                elif event.key == pygame.K_DOWN:
                    y1_change = snake_size
                    x1_change = 0

        # 判断是否撞墙
        if x1 >= window_width or x1 < 0 or y1 >= window_height or y1 < 0:
            game_over = True

        # 移动蛇的位置
        x1 += x1_change
        y1 += y1_change

        # 画出背景
        window.fill(black)

        # 画出食物
        pygame.draw.rect(window, red, [foodx, foody, snake_size, snake_size])

        # 更新蛇的位置
        snake_head = []
        snake_head.append(x1)
        snake_head.append(y1)
        snake_list.append(snake_head)
        if len(snake_list) > length_of_snake:
            del snake_list[0]

        # 判断是否吃到食物
        for x in snake_list[:-1]:
            if x == snake_head:
                game_over = True
        draw_snake(snake_size, snake_list)
        show_score(score)

        # 更新分数
        if x1 == foodx and y1 == foody:
            foodx = round(random.randrange(0, window_width - snake_size) / 10.0) * 10.0
            foody = round(random.randrange(0, window_height - snake_size) / 10.0) * 10.0
            length_of_snake += 1
            score += 10

        # 刷新屏幕
        pygame.display.update()

        # 控制游戏速度
        clock = pygame.time.Clock()
        clock.tick(snake_speed)

    # 关闭游戏
    pygame.quit()
    quit()

# 运行游戏
main()

注意：在运行代码前，需要先安装pygame库。可以使用命令行输入`pip install pygame`来安装。