code: def get_codec(bytes_):
      
      prefix = extract_prefix(bytes_)
      try:
          return CODE_TABLE[prefix]
      except KeyError:
          raise ValueError('Prefix {} not present in the lookup table'.format(prefix))
docs: Gets the codec used for prefix the multicodec prefixed data
  
      :param bytes bytes_: multicodec prefixed data bytes
      :return: name of the multicodec used to prefix
      :rtype: str