Remove unused import

src/python/grpcio/grpc/__init__.py

@@ -2125,5 +2125,5 @@ except ImportError:
     pass
 
 if sys.version_info >= (3, 6):
-    from grpc import aio
+    from grpc import aio  # pylint: disable=ungrouped-imports
     sys.modules.update({'grpc.aio': aio})

src/python/grpcio/grpc/aio/__init__.py

@@ -17,7 +17,6 @@ gRPC Async API objects may only be used on the thread on which they were
 created. AsyncIO doesn't provide thread safety for most of its APIs.
 """
 
-import sys
 from typing import Any, Optional, Sequence, Tuple
 
 import grpc