fix more lint

Author: sycai

samples/snippets/conftest.py

@@ -43,7 +43,7 @@ def bigquery_client() -> bigquery.Client:
 
 
 @pytest.fixture(scope="session")
-def storage_client(project_id) -> storage.Client:
+def storage_client(project_id: str) -> storage.Client:
     return storage.Client(project=project_id)
 
 
@@ -53,7 +53,7 @@ def project_id(bigquery_client: bigquery.Client) -> str:
 
 
 @pytest.fixture(scope="session")
-def gcs_bucket(storage_client) -> Generator[str, None, None]:
+def gcs_bucket(storage_client: storage.Client) -> Generator[str, None, None]:
     bucket_name = "bigframes-gcs-test"
 
     yield bucket_name

samples/snippets/sessions_and_io_test.py

@@ -12,8 +12,6 @@
 # See the License for the specific language governing permissions and
 # limitations under the License.
 
-from google.cloud import storage
-
 
 def test_sessions_and_io(project_id: str, dataset_id: str, gcs_bucket: str) -> None:
     YOUR_PROJECT_ID = project_id