code: def list_known_codes(s, unique=True, rgb_mode=False):
      
      total = 0
      for codedesc in get_known_codes(s, unique=unique, rgb_mode=rgb_mode):
          total += 1
          print(codedesc)
      plural = 'code' if total == 1 else 'codes'
      codetype = ' unique' if unique else ''
      print('\nFound {}{} escape {}.'.format(total, codetype, plural))
      return 0 if total > 0 else 1
docs: Find and print all known escape codes in a string,
          using get_known_codes.