xloya commented on code in PR #5777:
URL: https://github.com/apache/gravitino/pull/5777#discussion_r1877973226


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clients/client-python/gravitino/dto/responses/credential_response.py:
##########
@@ -0,0 +1,44 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+
+from typing import List
+from dataclasses import dataclass, field
+from dataclasses_json import config
+
+from gravitino.dto.credential_dto import CredentialDTO
+from gravitino.dto.responses.base_response import BaseResponse
+from gravitino.exceptions.base import IllegalArgumentException
+
+
+@dataclass
+class CredentialResponse(BaseResponse):
+    """Response for credential response."""
+
+    _credentials: List[CredentialDTO] = 
field(metadata=config(field_name="credentials"))
+
+    def credentials(self) -> List[CredentialDTO]:
+        return self._credentials
+
+    def validate(self):
+        """Validates the response data.
+
+        Raises:
+            IllegalArgumentException if credentials are None.
+        """
+        if self._credentials is None:

Review Comment:
   It's better to check the length of `List` object too.



##########
clients/client-python/gravitino/client/metadata_object_credential_operations.py:
##########
@@ -0,0 +1,67 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+
+import logging
+from typing import List
+from gravitino.api.credential.supports_credentials import SupportsCredentials
+from gravitino.api.credential.credential import Credential
+from gravitino.api.metadata_object import MetadataObject
+from gravitino.dto.credential_dto import CredentialDTO
+from gravitino.dto.responses.credential_response import CredentialResponse
+from gravitino.exceptions.handlers.credential_error_handler import (
+    CREDENTIAL_ERROR_HANDLER,
+)
+from gravitino.utils import HTTPClient
+from gravitino.utils.credential_utils import CredentialUtils
+
+logger = logging.getLogger(__name__)
+
+
+class MetadataObjectCredentialOperations(SupportsCredentials):
+    def __init__(
+        self,
+        metalake_name: str,
+        metadata_object: MetadataObject,
+        rest_client: HTTPClient,
+    ):
+        self._rest_client = rest_client
+        t = metadata_object.type().value

Review Comment:
   It's better to make this var more meaningful.



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