gh-96349: Fix minor performance regression initializing threading.Event

Lib/threading.py

@@ -262,18 +262,12 @@ def __init__(self, lock=None):
         # If the lock defines _release_save() and/or _acquire_restore(),
         # these override the default implementations (which just call
         # release() and acquire() on the lock).  Ditto for _is_owned().
-        try:
+        if hasattr(lock, '_release_save'):
             self._release_save = lock._release_save
-        except AttributeError:
-            pass
-        try:
+        if hasattr(lock, '_acquire_restore'):
             self._acquire_restore = lock._acquire_restore
-        except AttributeError:
-            pass
-        try:
+        if hasattr(lock, '_is_owned'):
             self._is_owned = lock._is_owned
-        except AttributeError:
-            pass
         self._waiters = _deque()
 
     def _at_fork_reinit(self):

Misc/NEWS.d/next/Library/2022-08-27-21-26-52.gh-issue-96349.XyYLlO.rst

@@ -0,0 +1 @@
+Fixed a minor performance regression in :func:`threading.Event.__init__`