Python 封闭科赫曲线绘制

#封闭科赫曲线绘制 
import turtle
def koch(size, n):
    if n == 0:
        turtle.fd(size)
    else:
        for angle in [0, 60, -120, 60]:
           turtle.left(angle)
           koch(size/3, n-1)
def main():
    turtle.setup(600,600)
    turtle.speed(4)
    turtle.penup()
    turtle.goto(-200, 100)
    turtle.pendown()
    turtle.pensize(2)
    turtle.color('red')
    level = 3
    koch(400,level) 
    turtle.right(120)#往右旋转120度
    koch(400,level)
    turtle.right(120)
    koch(400,level)
    turtle.hideturtle()
    time.sleep(5)
    turtle.bye() 
main()