基于python绘制科赫雪花

#KocheDraw1
import turtle
def koch(size,n):
  if n==1:
    turtle.fd(size)
  else:
    for i in [0,60,-120,60]:
      turtle.left(i)
      koch(size/3,n-1)
def main():
  turtle.setup(600,600)
  turtle.penup()
  turtle.speed(10)
  turtle.hideturtle()
  turtle.pensize(2)
  turtle.goto(-200,100)
  turtle.pendown()
  level=4
  koch(400,level)
  turtle.right(120)
  koch(400, level)
  turtle.right(120)
  koch(400, level)
  turtle.penup()
  turtle.done()
main()