code: def lighten(self, amount):
          ''' Lighten (increase the luminance) of this color.
  
          Args:
              amount (float) :
                  Amount to increase the luminance by (clamped above zero)
  
          Returns:
              Color
  
          '''
          hsl = self.to_hsl()
          hsl.l = self.clamp(hsl.l + amount, 1)
          return self.from_hsl(hslf lighten(self, amount):
          ''' Lighten (increase the luminance) of this color.
  
          Args:
              amount (float) :
                  Amount to increase the luminance by (clamped above zero)
  
          Returns:
              Color
  
          '''
          hsl = self.to_hsl()
          hsl.l = self.clamp(hsl.l + amount, 1)
          return self.from_hsl(hsl)
docs: Lighten (increase the luminance) of this color.
  
          Args:
              amount (float) :
                  Amount to increase the luminance by (clamped above zero)
  
          Returns:
              Color