我的解释器是Python3.9，帮我写个贪吃蛇的游戏

当然可以！以下是一个简单的贪吃蛇游戏的代码：

import pygame
import random

# 初始化pygame
pygame.init()

# 设置游戏窗口大小
window_width = 500
window_height = 500
window = pygame.display.set_mode((window_width, window_height))

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

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

# 定义蛇的初始位置和大小
snake_block_size = 10
snake_speed = 15
snake_list = []
snake_length = 1
snake_x = window_width / 2
snake_y = window_height / 2

# 定义食物的初始位置和大小
food_block_size = 10
food_x = round(random.randrange(0, window_width - food_block_size) / 10.0) * 10.0
food_y = round(random.randrange(0, window_height - food_block_size) / 10.0) * 10.0

# 定义蛇的移动方向
direction = "right"

# 定义字体
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)
    window.blit(score_text, [0, 0])

# 定义画蛇的函数
def draw_snake(snake_block_size, snake_list):
    for x in snake_list:
        pygame.draw.rect(window, black, [x[0], x[1], snake_block_size, snake_block_size])

# 开始游戏循环
game_over = False
score = 0
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:
                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"

    # 移动蛇的位置
    if direction == "right":
        snake_x += snake_block_size
    elif direction == "left":
        snake_x -= snake_block_size
    elif direction == "up":
        snake_y -= snake_block_size
    elif direction == "down":
        snake_y += snake_block_size

    # 判断蛇是否吃到了食物
    if snake_x == food_x and snake_y == food_y:
        food_x = round(random.randrange(0, window_width - food_block_size) / 10.0) * 10.0
        food_y = round(random.randrange(0, window_height - food_block_size) / 10.0) * 10.0
        snake_length += 1
        score += 10

    # 更新蛇的位置
    snake_head = []
    snake_head.append(snake_x)
    snake_head.append(snake_y)
    snake_list.append(snake_head)
    if len(snake_list) > snake_length:
        del snake_list[0]

    # 判断蛇是否碰到了边界或自己的身体
    for x in snake_list[:-1]:
        if x == snake_head:
            game_over = True
    if snake_x < 0 or snake_x >= window_width or snake_y < 0 or snake_y >= window_height:
        game_over = True

    # 绘制游戏界面
    window.fill(white)
    pygame.draw.rect(window, red, [food_x, food_y, food_block_size, food_block_size])
    draw_snake(snake_block_size, snake_list)
    show_score(score)
    pygame.display.update()

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

# 退出pygame
pygame.quit()
quit()

希望这个代码能够帮到你！