From: Arie Bovenberg <a.c.bovenberg@gmail.com>
Date: Fri, 21 Jan 2022 16:02:50 +0000 (+0100)
Subject: add empty slots to three more base classes
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=e448f979d1ad138f91b8bee5a19f911aed1f2e69;p=thirdparty%2Fsqlalchemy%2Fsqlalchemy.git

add empty slots to three more base classes
---

diff --git a/lib/sqlalchemy/sql/operators.py b/lib/sqlalchemy/sql/operators.py
index cf61f26376..255e77b7f9 100644
--- a/lib/sqlalchemy/sql/operators.py
+++ b/lib/sqlalchemy/sql/operators.py
@@ -57,6 +57,8 @@ _T = TypeVar("_T", bound=Any)
 class OperatorType(Protocol):
     """describe an op() function."""
 
+    __slots__ = ()
+
     __name__: str
 
     def __call__(
diff --git a/lib/sqlalchemy/sql/visitors.py b/lib/sqlalchemy/sql/visitors.py
index 78384782b8..04cd529fbd 100644
--- a/lib/sqlalchemy/sql/visitors.py
+++ b/lib/sqlalchemy/sql/visitors.py
@@ -184,6 +184,8 @@ class _HasTraversalDispatch:
 
     """
 
+    __slots__ = ()
+
     def __init_subclass__(cls) -> None:
         cls._generate_traversal_dispatch()
         super().__init_subclass__()
@@ -299,6 +301,8 @@ class InternalTraversal(_HasTraversalDispatch):
 
     """
 
+    __slots__ = ()
+
     dp_has_cache_key = symbol("HC")
     """Visit a :class:`.HasCacheKey` object."""