From 072eeaf84cdc4cae4a7e6a72c408b3281fba2b26 Mon Sep 17 00:00:00 2001
From: "Miss Islington (bot)"
 <31488909+miss-islington@users.noreply.github.com>
Date: Thu, 20 Nov 2025 02:01:49 +0100
Subject: [PATCH] [3.14] gh-132657: optimize `PySet_Contains` for `frozenset`
 (GH-141183) (gh-141773)

(cherry picked from commit 7211a34fe1d9704935342af8c9b46725629f2d97)

Co-authored-by: Kumar Aditya <kumaraditya@python.org>
---
 Objects/setobject.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/Objects/setobject.c b/Objects/setobject.c
index 9332c24ac867..ff4844b24371 100644
--- a/Objects/setobject.c
+++ b/Objects/setobject.c
@@ -2746,7 +2746,9 @@ PySet_Contains(PyObject *anyset, PyObject *key)
         PyErr_BadInternalCall();
         return -1;
     }
-
+    if (PyFrozenSet_CheckExact(anyset)) {
+        return set_contains_key((PySetObject *)anyset, key);
+    }
     int rv;
     Py_BEGIN_CRITICAL_SECTION(anyset);
     rv = set_contains_key((PySetObject *)anyset, key);
-- 
2.47.3