Untitled

from turtle import *

def koch(n):

    speed(0)

    t=500

    up()
    goto(-250,140)
    pd()
    seth(0)

    for k in range(3):
        fractale(n,t)
        left(-120)


def fractale(n,t):

    if n > 0 :
        fractale(n-1,t/3)
        left(60)
        fractale(n-1,t/3)
        left(-120)
        fractale(n-1,t/3)
        left(60)
        fractale(n-1,t/3)

    else :
        forward(t)