diff --git a/clients/client-python/gravitino/auth/default_oauth_to_token_provider.py b/clients/client-python/gravitino/auth/default_oauth_to_token_provider.py
index b185f3a3c23..3fb73039568 100644
--- a/clients/client-python/gravitino/auth/default_oauth_to_token_provider.py
+++ b/clients/client-python/gravitino/auth/default_oauth_to_token_provider.py
@@ -26,7 +26,7 @@
 from gravitino.dto.requests.oauth2_client_credential_request import (
     OAuth2ClientCredentialRequest,
 )
-from gravitino.exceptions.gravitino_runtime_exception import GravitinoRuntimeException
+from gravitino.exceptions.base import GravitinoRuntimeException
 
 CLIENT_CREDENTIALS = "client_credentials"
 CREDENTIAL_SPLITTER = ":"
diff --git a/clients/client-python/gravitino/utils/http_client.py b/clients/client-python/gravitino/utils/http_client.py
index d12e09e52fa..89b75d64145 100644
--- a/clients/client-python/gravitino/utils/http_client.py
+++ b/clients/client-python/gravitino/utils/http_client.py
@@ -150,6 +150,7 @@ def _make_request(self, opener, request, timeout=None) -> Tuple[bool, Response]:
 
             return (False, err_resp)
 
+    # pylint: disable=too-many-locals
     def _request(
         self,
         method,
@@ -224,8 +225,11 @@ def put(self, endpoint, json=None, error_handler=None, **kwargs):
         return self._request(
             "put", endpoint, json=json, error_handler=error_handler, **kwargs
         )
+
     def post_form(self, endpoint, data=None, error_handler=None, **kwargs):
-        return self._request("post", endpoint, data=data, error_handler=error_handler **kwargs)
+        return self._request(
+            "post", endpoint, data=data, error_handler=error_handler**kwargs
+        )
 
     def close(self):
         self._request("close", "/")
diff --git a/clients/client-python/tests/unittests/auth/test_simple_auth_provider.py b/clients/client-python/tests/unittests/auth/test_simple_auth_provider.py
index d8c10e4671a..45f7c14882c 100644
--- a/clients/client-python/tests/unittests/auth/test_simple_auth_provider.py
+++ b/clients/client-python/tests/unittests/auth/test_simple_auth_provider.py
@@ -50,3 +50,4 @@ def test_auth_provider(self):
             token[len(AuthConstants.AUTHORIZATION_BASIC_HEADER) :]
         ).decode("utf-8")
         self.assertEqual(f"{user}:dummy", token_string)
+        os.environ["GRAVITINO_USER"] = ""