import turtle
t = turtle.Turtle()
t.speed(0) # 1:slowest, 3:slow, 5:normal, 10:fast, 0:fastest
t.pensize(2)
pattern=0
for i in range(150):
  for color in ["red","orange","yellow","green","blue","indigo","violet"]:
    t.color(color)
    t.forward(pattern)
    t.right(222.48)
    t.right(1)
    pattern+=1
t.penup()
t.hideturtle()
t.done()