code: def text_color(background, dark_color=rgb_min, light_color=rgb_max):
      
      max_y = rgb_to_yiq(rgb_max)[0]
      return light_color if rgb_to_yiq(background)[0] <= max_y / 2 else dark_color
docs: Given a background color in the form of an RGB 3-tuple, returns the color the text should be (defaulting to white
      and black) for best readability. The light (white) and dark (black) defaults can be overridden to return preferred
      values.
  
      :param background:
      :param dark_color:
      :param light_color:
      :return: