import turtle

def draw_triangle(points, color, my_turtle):
  my_turtle.fillcolor(color)
  my_turtle.up()
  my_turtle.goto(points[0][0],points[0][1])
  my_turtle.down()
  my_turtle.begin_fill()
  my_turtle.goto(points[1][0], points[1][1])
  my_turtle.goto(points[2][0], points[2][1])
  my_turtle.goto(points[0][0], points[0][1])
  my_turtle.end_fill()

def get_mid(p1, p2):
  return ((p1[0] + p2[0]) / 2, (p1[1] + p2[1]) / 2)

def sierpinski(points, degree, my_turtle):
  color_map = ['blue', 'red', 'green', 'white', 'yellow',
              'violet', 'orange']
  draw_triangle(points, color_map[degree], my_turtle)
  if degree > 0:
    sierpinski([points[0],
                get_mid(points[0], points[1]),
                get_mid(points[0], points[2])],
                degree-1, my_turtle)
    sierpinski([points[1],
                get_mid(points[0], points[1]),
                get_mid(points[1], points[2])],
                degree-1, my_turtle)
    sierpinski([points[2],
                get_mid(points[2], points[1]),
                get_mid(points[0], points[2])],
                degree-1, my_turtle)
def main():
  my_turtle = turtle.Turtle()
  my_win = turtle.Screen()
  my_points = [[-100, -50], [0, 100], [100, -50]]
  sierpinski(my_points, 3, my_turtle)

main()