From f32b2cd3d514b941fde468808cfe9fa3e1fbcb1c Mon Sep 17 00:00:00 2001
From: Arie Bovenberg <a.c.bovenberg@gmail.com>
Date: Thu, 20 Jan 2022 19:42:10 +0100
Subject: [PATCH] add slots to base class TransactionalContext

---
 lib/sqlalchemy/engine/util.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/sqlalchemy/engine/util.py b/lib/sqlalchemy/engine/util.py
index 7e41339bbb..6aadd5c5fe 100644
--- a/lib/sqlalchemy/engine/util.py
+++ b/lib/sqlalchemy/engine/util.py
@@ -43,7 +43,7 @@ class TransactionalContext:
 
     """
 
-    _trans_subject = None
+    __slots__ = ("_outer_trans_ctx", "_trans_subject")
 
     def _transaction_is_active(self):
         raise NotImplementedError()
-- 
2.47.3