#CODE = #B095
import turtle as t
import colorsys
t.bgcolor("black")
t.tracer(50)
t.width(5)
t.pensize(1)
h = 0
for i in range(600):
    c = colorsys.hsv_to_rgb(h,1,1)
    h += 0.005
    t.color(c)
    t.up()
    t.goto(0,0)
    t.fd(i-1)
    t.down()
    t.circle(i,100)
    t.lt(45)
t.done()