def drag(l, n, angle=45):
    L = l * 2 ** .5 / 2
    if n == 1:
        turtle.rt(angle)
        turtle.fd(L)
        turtle.lt(angle * 2)
        turtle.fd(L)
        turtle.rt(angle)
    else:
        turtle.rt(angle)
        drag(L, n - 1)
        turtle.lt(angle * 2)
        drag(L, n - 1, angle=-angle)
        turtle.rt(angle)


colors = ["black", "red", "green", "blue", "cyan", "yellow", "magenta"]
for i in range(1, 4):
    turtle.width(10 - i * 2)
    turtle.color(colors[i])
    drag(300, i)
    restart()
turtle.exitonclick()