1517-p1.py

        if not two_factor:
            for key_filename in key_filenames:
                for pkey_class in (RSAKey, DSSKey, ECDSAKey, Ed25519Key):
                    try:
                        key = self._key_from_filepath(
                            key_filename, pkey_class, passphrase
                        )
                        allowed_types = set(
                            self._transport.auth_publickey(username, key)
                        )
                        two_factor = allowed_types & two_factor_types
                        if not two_factor:
                            return
                        break
                    except SSHException as e:
                        saved_exception = e