code: def from_str(cls: Type[CRCPubkeyType], crc_pubkey: str) -> CRCPubkeyType:
          
          data = CRCPubkey.re_crc_pubkey.match(crc_pubkey)
          if data is None:
              raise Exception("Could not parse CRC public key {0}".format(crc_pubkey))
          pubkey = data.group(1)
          crc = data.group(2)
          return cls(pubkey, crc)
docs: Return CRCPubkey instance from CRC public key string
  
          :param crc_pubkey: CRC public key
          :return: