Apply suggestions from code review

Co-authored-by: Bénédikt Tran <[email protected]>

Author: csm10495

Doc/whatsnew/3.14.rst

@@ -443,13 +443,13 @@ contextvars
 
 * Support context manager protocol by :class:`contextvars.Token`.
   (Contributed by Andrew Svetlov in :gh:`129889`.)
-
-
+ 
 * Add :meth:`concurrent.futures.ProcessPoolExecutor.terminate_workers` and
   :meth:`concurrent.futures.ProcessPoolExecutor.kill_workers` as
   ways to terminate or kill all living worker processes in the given pool.
   (Contributed by Charles Machalow in :gh:`128043`.)
 
+
 ctypes
 ------
 

Lib/concurrent/futures/process.py

@@ -878,7 +878,7 @@ def _terminate_or_kill_workers(self, operation: _TerminateOrKillOperation):
         and no longer usable (for instance, new tasks should not be
         submitted).
         """
-        if operation not in _TerminateOrKillOperation._member_map_.values():
+        if operation not in _TerminateOrKillOperation:
             raise ValueError(f"Unsupported operation: {operation}")
 
         processes = {}

Lib/test/test_concurrent_futures/test_process_pool.py

@@ -230,7 +230,7 @@ def mock_start_new_thread(func, *args, **kwargs):
 
     def test_process_pool_executor_terminate_kill_workers(self):
         for function_name in ('terminate_workers', 'kill_workers'):
-            with self.subTest(function_name=function_name):
+            with self.subTest(function_name):
                 manager = multiprocessing.Manager()
                 q = manager.Queue()