Fix python codestyle

pyspark-notebook/test/test_spark.py

@@ -1,12 +1,11 @@
 # Copyright (c) Jupyter Development Team.
 # Distributed under the terms of the Modified BSD License.
-import time
 import logging
 
-import pytest
 
 LOGGER = logging.getLogger(__name__)
 
+
 def test_spark_shell(container):
     """Checking if Spark (spark-shell) is running properly"""
     c = container.run(
@@ -18,6 +17,7 @@ def test_spark_shell(container):
     LOGGER.debug(logs)
     assert 'res0: Int = 2' in logs
 
+
 def test_pyspark(container):
     """PySpark should be in the Python path"""
     c = container.run(