请用Python写一个贪吃蛇的小游戏

好的，我可以为您提供 Python 代码实现贪吃蛇小游戏。以下是代码：

import pygame
import random

# 初始化pygame
pygame.init()

# 设定游戏屏幕大小
screen = pygame.display.set_mode((400, 400))

# 定义颜色变量
white = (255, 255, 255)
black = (0, 0, 0)
red = (213, 50, 80)
green = (0, 255, 0)
blue = (50, 153, 213)

# 设定游戏字体
font_style = pygame.font.SysFont(None, 30)


# 定义函数显示得分
def show_score(score):
    value = font_style.render("Score: " + str(score), True, white)
    screen.blit(value, [0, 0])


# 定义函数画蛇
def draw_snake(snake_block, snake_list):
    for x in snake_list:
        pygame.draw.rect(screen, blue, [x[0], x[1], snake_block, snake_block])


# 定义游戏循环
def gameLoop():
    game_over = False
    game_close = False

    # 初始化蛇位置和移动方向
    x1 = 200
    y1 = 200

    x1_change = 0
    y1_change = 0

    # 初始化苹果位置
    foodx = round(random.randrange(0, 400 - snake_block) / 10.0) * 10.0
    foody = round(random.randrange(0, 400 - snake_block) / 10.0) * 10.0

    # 初始化蛇身列表
    snake_list = []
    Length_of_snake = 1

    # 设定刷新频率
    clock = pygame.time.Clock()

    while not game_over:

        while game_close == True:
            screen.fill(black)
            message = font_style.render("You Lost! Press Q-Quit or C-Play Again", True, white)
            message_rect = message.get_rect(center=(200, 200))
            screen.blit(message, message_rect)

            show_score(Length_of_snake - 1)
            pygame.display.update()

            # 循环判断游戏结束或者重新开始
            for event in pygame.event.get():
                if event.type == pygame.KEYDOWN:
                    if event.key == pygame.K_q:
                        game_over = True
                        game_close = False
                    if event.key == pygame.K_c:
                        gameLoop()

        # 循环判断用户鼠标点击动作
        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_block
                    y1_change = 0
                elif event.key == pygame.K_RIGHT:
                    x1_change = snake_block
                    y1_change = 0
                elif event.key == pygame.K_UP:
                    y1_change = -snake_block
                    x1_change = 0
                elif event.key == pygame.K_DOWN:
                    y1_change = snake_block
                    x1_change = 0

        # 判断撞墙和撞到自己
        if x1 >= 400 or x1 < 0 or y1 >= 400 or y1 < 0:
            game_close = True
        x1 += x1_change
        y1 += y1_change
        screen.fill(black)
        pygame.draw.rect(screen, green, [foodx, foody, snake_block, snake_block])

        # 将蛇头加入蛇身列表
        snake_Head = []
        snake_Head.append(x1)
        snake_Head.append(y1)
        snake_list.append(snake_Head)

        # 只保留蛇身长度
        if len(snake_list) > Length_of_snake:
            del snake_list[0]

        # 撞到自己，游戏结束
        for x in snake_list[:-1]:
            if x == snake_Head:
                game_close = True

        # 画蛇和苹果，并计算得分
        draw_snake(snake_block, snake_list)
        show_score(Length_of_snake - 1)
        pygame.display.update()

        # 吃到苹果，加长一节
        if x1 == foodx and y1 == foody:
            foodx = round(random.randrange(0, 400 - snake_block) / 10.0) * 10.0
            foody = round(random.randrange(0, 400 - snake_block) / 10.0) * 10.0
            Length_of_snake += 1

        # 设定刷新频率
        clock.tick(snake_speed)

    # 退出pygame，退出python
    pygame.quit()
    quit()


# 初始化游戏相关参数
snake_block = 10
snake_speed = 15

# 开始游戏
gameLoop()

请注意，此代码仅供参考，您可能需要修改以适应您的游戏需求。