chore: some lint fixes [(#3748)](GoogleCloudPlatform/python-docs-samples#3748)

Author: Takashi Matsuo

samples/snippets/quickstart/pub_test.py

@@ -15,13 +15,14 @@
 # limitations under the License.
 
 import os
-import pytest
 import uuid
 
 from google.api_core.exceptions import AlreadyExists
 from google.cloud import pubsub_v1
+import pytest
+
+import pub  # noqa
 
-import pub
 
 UUID = uuid.uuid4().hex
 PROJECT = os.environ["GCLOUD_PROJECT"]

samples/snippets/quickstart/sub_test.py

@@ -13,16 +13,15 @@
 # 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 mock
 import os
-import pytest
 import uuid
 
 from google.api_core.exceptions import AlreadyExists
 from google.cloud import pubsub_v1
+import mock
+import pytest
 
-import sub
+import sub  # noqa
 
 
 UUID = uuid.uuid4().hex