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画雪花代码：
import turtle
from turtle import *
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.pen(speed = 0, pencolor = 'red')
turtle.penup()
turtle.goto(-200,100)
turtle.pendown()
turtle.pensize(1)
level = 5
koch(400,level)
turtle.right(120)
koch(400, level)
turtle.right(120)
koch(400, level)
turtle.hideturtle()
done()
main()
结果：
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