你用kivy包实现一个躲避障碍物的小游戏，请给出一个可以直接运行的python代码。同时不要使用kivy.properties 库

好的，以下是一个使用kivy包实现的躲避障碍物小游戏的Python代码，不使用kivy.properties库：

import random
from kivy.app import App
from kivy.clock import Clock
from kivy.core.window import Window
from kivy.graphics import Rectangle
from kivy.uix.widget import Widget


class Player(Widget):
    def __init__(self, **kwargs):
        super().__init__(**kwargs)
        self.size = (50, 50)
        self.pos = (Window.width // 2 - self.width // 2, 0)

    def move(self, direction):
        if direction == 'left':
            self.x -= 50
        elif direction == 'right':
            self.x += 50
        elif direction == 'up':
            self.y += 50
        elif direction == 'down':
            self.y -= 50

        # 碰到边界就停止移动
        if self.x < 0:
            self.x = 0
        elif self.right > Window.width:
            self.right = Window.width
        if self.y < 0:
            self.y = 0
        elif self.top > Window.height:
            self.top = Window.height


class Obstacle(Widget):
    def __init__(self, **kwargs):
        super().__init__(**kwargs)
        self.size = (50, 50)
        self.pos = (random.randint(0, Window.width - self.width), Window.height)

    def move(self, speed):
        self.y -= speed


class Game(Widget):
    def __init__(self, **kwargs):
        super().__init__(**kwargs)
        self.player = Player()
        self.obstacles = []
        self.speed = 5
        self.game_over = False
        self.add_widget(self.player)
        Clock.schedule_interval(self.update, 1/60)

    def on_touch_down(self, touch):
        if touch.x < Window.width / 2:
            self.player.move('left')
        else:
            self.player.move('right')

    def update(self, dt):
        if not self.game_over:
            self.add_obstacle()
            self.move_obstacles()
            self.check_collision()

    def add_obstacle(self):
        if len(self.obstacles) < 10 and random.random() < 0.05:
            obstacle = Obstacle()
            self.obstacles.append(obstacle)
            self.add_widget(obstacle)

    def move_obstacles(self):
        for obstacle in self.obstacles:
            obstacle.move(self.speed)
            if obstacle.top < 0:
                self.remove_widget(obstacle)
                self.obstacles.remove(obstacle)

    def check_collision(self):
        for obstacle in self.obstacles:
            if obstacle.collide_widget(self.player):
                self.game_over = True
                print('Game Over')
                return

    def draw(self):
        self.canvas.clear()
        with self.canvas:
            Rectangle(pos=self.player.pos, size=self.player.size)

            for obstacle in self.obstacles:
                Rectangle(pos=obstacle.pos, size=obstacle.size)


class DodgeGame(App):
    def build(self):
        game = Game()
        return game


if __name__ == '__main__':
    DodgeGame().run()

运行上面的代码，你就可以体验到这个小游戏了。在游戏中，你需要控制玩家躲避障碍物，随着时间的推移，障碍物的数量和速度都会不断增加，难度也会随之提高。