Update TC_OCC_3_2.py

src/python_testing/TC_OCC_3_2.py

@@ -16,10 +16,13 @@
 #
 
 import logging
-
+import time
+import queue
+from typing import Any, List, Optional, Tuple
 from chip import ChipDeviceCtrl
 import chip.clusters as Clusters
 from chip.clusters.Types import NullValue
+from chip.clusters.Attribute import EventReadResult, SubscriptionTransaction, TypedAttributePath
 from matter_testing_support import MatterBaseTest, ClusterAttributeChangeAccumulator, TestStep, async_test_body, default_matter_test_main
 from mobly import asserts