turtle模块制作的弹球，面向对象，python海龟可不仅仅是画图

from turtle import *
from random import randint

s = Screen()
s.title("turtle模块制作的弹球_作者:李兴球")
s.setup(800,600)
s.delay(0)
class Ball(Turtle):
    def __init__(self,x,y):
        Turtle.__init__(self)
        self.shape('circle')
        self.visible = False
        self.penup()
        self.speed(0)
        self.xspeed=randint(-20,20)
        self.yspeed=randint(-20,20)
        self.setheading(90)
        self.showturtle()
        self.move()
    def move(self):
        x=(self.xcor() + self.xspeed)
        y=(self.ycor() + self.yspeed)
        self.goto(x,y)
        if abs(self.xcor())>=380:self.xspeed = - self.xspeed
        if abs(self.ycor())>=280:self.yspeed = - self.yspeed        
        s.ontimer(self.move,1)

[Ball(0,0),Ball(0,0),Ball(0,0),Ball(0,0)]
s.mainloop()
    
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