帮我写一个贪吃蛇的程序

贪吃蛇是一个经典的计算机游戏，通常使用文本界面或者图形界面实现。下面是一个简单的Python版本的文本界面贪吃蛇游戏的基本框架。由于篇幅有限，这里只给出核心部分的代码，完整的程序需要结合循环、条件判断以及一些游戏逻辑。

import random

# 初始化游戏设置
snake_speed = 0.1
snake_direction = "right"
snake_body = [(0, 0), (1, 0)]
food_position = (random.randint(0, len(snake_body)), random.randint(0, len(snake_body[0])))

while True:
    # 获取用户输入的新方向
    user_input = input("移动方向（上, 下, 左, 右）:")
    snake_direction = {"up": (-1, 0), "down": (1, 0), "left": (0, -1), "right": (0, 1)}[user_input.lower()]

    # 更新蛇的位置
    next_head = (snake_body[-1][0] + snake_direction[0], snake_body[-1][1] + snake_direction[1])
    if next_head in snake_body[:-1]:
        print("Game Over! You hit your tail!")
        break
    snake_body.append(next_head)
    
    # 移动食物
    new_food_position = (random.randint(0, len(snake_body) - 1), random.randint(0, len(snake_body[0]) - 1))
    while new_food_position in snake_body:
        new_food_position = (random.randint(0, len(snake_body) - 1), random.randint(0, len(snake_body[0]) - 1))
    food_position = new_food_position

    # 打印当前状态
    print("_____________________________")
    for y in range(len(snake_body[0])):
        for x in range(len(snake_body)):
            if (x, y) == food_position:
                print("#", end="")
            elif (x, y) in snake_body:
                print("S", end="")
            else:
                print(" ", end="")
        print()
    print("Score: ", len(snake_body) - 3)  # 减去头和身体，因为头不算得分

    # 控制游戏速度
    import time
    time.sleep(snake_speed)