Applied hack suggested by

python/mypy#1297 (comment)

Author: Lenny Meerwood

tests/providers/oracle/hooks/test_oracle.py

@@ -28,9 +28,11 @@
 from airflow.providers.oracle.hooks.oracle import OracleHook
 
 try:
-    import oracledb
+    import oracledb as _oracledb
 except ImportError:
     oracledb = None
+else:
+    oracledb = _oracledb
 
 
 @unittest.skipIf(oracledb is None, 'oracledb package not present')