python_practics

   from turtle import Screen, Pen

   import colorsys



   screen = Screen()

   screen.title("Rainbow Spiral")



   pen = Pen()

   pen.speed('fastest')



   hue = 0.0  # range is 0.0 to 1.0



   for i in range(200):

    color = colorsys.hsv_to_rgb(hue, 1, 1)  # pen wants RGB

    pen.pencolor(color)

    pen.forward(i * 2)  # double size

    pen.right(121)  # 120 degrees is an equilateral triangle

    hue += 0.005  # increment by 1/200



   pen.hideturtle()



   screen.exitonclick()