科赫雪花

import turtle


def (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(0.5,0.8)
    turtle.speed(0)
    turtle.penup()
    turtle.goto(-200, 100)
    turtle.pendown()
    turtle.pensize(2)
    koch(600,3)
    turtle.hideturtle()
    turtle.done()


if __name__ == '__main__':
    main()

import turtle


def (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(0.5,0.8)
    turtle.speed(0)
    turtle.penup()
    turtle.goto(-200, 100)
    turtle.pendown()
    turtle.pensize(2)
    level = 3
    koch(400, level)
    turtle.right(120)
    koch(400, level)
    turtle.right(120)
    koch(400, level)
    turtle.hideturtle()
    turtle.done()


if __name__ == '__main__':
    main()