import turtle
t = turtle.Turtle()
ts = turtle.Screen()

ts.bgcolor('black')
t.pensize(2)
t.speed(0)

for i in range(6):
	for color in ('red', 'magenta', 'blue',
				'cyan', 'green',
				'yellow'):
		t.color(color)
		t.circle(100)
		t.left(10)
	t.hideturtle()
t.done()