code: def toggle(s):
      
      is_numeric = ',' in s or s.startswith('0x') or s.startswith('#')
      c = name_to_color(s)
      return color_to_name(c) if is_numeric else str(c)
docs: Toggle back and forth between a name and a tuple representation.
  
      :param str s: a string which is either a text name, or a tuple-string:
                    a string with three numbers separated by commas
  
      :returns: if the string was a text name, return a tuple.  If it's a
                tuple-string and it corresponds to a text name, return the text
                name, else return the original tuple-string.