请用python tkinter库写一个双人贪吃蛇游戏

好的，以下是使用Python的Tkinter库编写双人贪吃蛇游戏的代码示例：

import tkinter as tk
import random

# 游戏界面的宽度和高度
WIDTH = 400
HEIGHT = 400

# 蛇的身体长度和速度
SNAKE_SIZE = 20
SNAKE_SPEED = 100

class SnakeGame(tk.Tk):
    def __init__(self):
        tk.Tk.__init__(self)

        self.canvas = tk.Canvas(self, width=WIDTH, height=HEIGHT)
        self.canvas.pack()
        
        # 初始化蛇的位置和方向
        self.snake = [(100, 100), (80, 100), (60, 100)]
        self.direction = "Right"

        # 初始化食物的位置
        self.food = self._create_food()

        # 绑定键盘事件
        self.bind("<Key>", self._on_key_press)
        
        # 开始游戏循环
        self._game_loop()

    def _create_food(self):
        x = random.randint(1, (WIDTH - SNAKE_SIZE) // SNAKE_SIZE) * SNAKE_SIZE
        y = random.randint(1, (HEIGHT - SNAKE_SIZE) // SNAKE_SIZE) * SNAKE_SIZE
        return x, y

    def _draw_snake(self):
        self.canvas.delete("snake")
        for x, y in self.snake:
            self.canvas.create_rectangle(x, y, x + SNAKE_SIZE, y + SNAKE_SIZE, fill="green", tag="snake")

    def _draw_food(self):
        x, y = self.food
        self.canvas.create_rectangle(x, y, x + SNAKE_SIZE, y + SNAKE_SIZE, fill="red", tag="food")

    def _move_snake(self):
        head_x, head_y = self.snake[0]
        if self.direction == "Up":
            new_head = (head_x, head_y - SNAKE_SIZE)
        elif self.direction == "Down":
            new_head = (head_x, head_y + SNAKE_SIZE)
        elif self.direction == "Left":
            new_head = (head_x - SNAKE_SIZE, head_y)
        else:
            new_head = (head_x + SNAKE_SIZE, head_y)

        self.snake.insert(0, new_head)
        self.snake.pop()

    def _check_collision(self):
        head_x, head_y = self.snake[0]
        if (
            head_x < 0
            or head_x >= WIDTH
            or head_y < 0
            or head_y >= HEIGHT
            or (head_x, head_y) in self.snake[1:]
        ):
            return True

        if (head_x, head_y) == self.food:
            self.snake.append((0, 0))
            self.food = self._create_food()

        return False

    def _on_key_press(self, event):
        if event.keysym == "Up" and self.direction != "Down":
            self.direction = "Up"
        elif event.keysym == "Down" and self.direction != "Up":
            self.direction = "Down"
        elif event.keysym == "Left" and self.direction != "Right":
            self.direction = "Left"
        elif event.keysym == "Right" and self.direction != "Left":
            self.direction = "Right"

    def _game_loop(self):
        if not self._check_collision():
            self._move_snake()
            self._draw_snake()
            self._draw_food()
            self.after(SNAKE_SPEED, self._game_loop)
        else:
            self.canvas.create_text(
                WIDTH // 2,
                HEIGHT // 2,
                text="Game Over",
                font=("Helvetica", 24),
                fill="red",
                tag="gameover",
            )

game = SnakeGame()
game.mainloop()

这个代码使用Tkinter库创建了一个窗口，游戏界面大小为400x400像素。蛇的身体由矩形组成，随着方向键的按下而移动。食物是一个红色的方块，当蛇吃掉食物时，身体长度增加。如果蛇撞到边界或自己的身体，游戏结束。