import turtle as t
t.pensize(0)
t.bgcolor("black")
t.pensize("2")
for x in range(70):
t.color("blue")
t.forward(2*x)
t.left(91)
for x in range(70,140):
t.color("yellow")
t.forward(2*x)
t.left(91)
for x in range(140,210):
t.color("red")
t.forward(2*x)
t.left(91)