code: def html_to_rgb(colorstring):
      
      colorstring = colorstring.strip()
      if colorstring[0] == '#':
          colorstring = colorstring[1:]
  
      if len(colorstring) != 6:
          raise ValueError("input #%s is not in #RRGGBB format" % colorstring)
  
      r, g, b = colorstring[:2], colorstring[2:4], colorstring[4:]
      r, g, b = [int(n, 16) for n in (r, g, b)]
  
      return (r, g, b, 255)
docs: convert #RRGGBB to an (R, G, B) tuple