code: def complementary_color(self, mode='ryb'):
      
      h, s, l = self.__hsl
  
      if mode == 'ryb': h = rgb_to_ryb(h)
      h = (h+180)%360
      if mode == 'ryb': h = ryb_to_rgb(h)
  
      return Color((h, s, l), 'hsl', self.__a, self.__wref)
docs: Create a new instance which is the complementary color of this one.
  
      Parameters:
        :mode:
          Select which color wheel to use for the generation (ryb/rgb).
  
  
      Returns:
        A grapefruit.Color instance.
  
      >>> Color.from_hsl(30, 1, 0.5).complementary_color(mode='rgb')
      Color(0.0, 0.5, 1.0, 1.0)
      >>> Color.from_hsl(30, 1, 0.5).complementary_color(mode='rgb').hsl
      (210.0, 1.0, 0.5)