代码

#科赫雪花
import turtle

def kehe(len,n):
    if n == 0:
        turtle.fd(len)
    else:
        for i in [0,60,-120,60]:
            turtle.left(i)
            kehe(len / 3, n - 1)
lenth = 500
level = 3
du = 120
def main():
    turtle.penup()
    turtle.goto(-100,100)
    turtle.pensize(2)
    turtle.color('red')
    turtle.pendown()

    kehe(lenth,level)
    turtle.right(du)
    kehe(lenth, level)
    turtle.right(du)
    kehe(lenth, level)
    turtle.right(du)
    turtle.hideturtle()
    turtle.done()

main()
结果演示