From e3d59bf553c7176f235cb128a70f4fcb0d45d3bd Mon Sep 17 00:00:00 2001
From: sobolevn <mail@sobolevn.me>
Date: Sat, 9 May 2026 10:55:09 +0300
Subject: [PATCH] gh-149083: Convert `_initial_missing` for pure py `reduce` to
 `sentinel` (GH-149536) (cherry picked from commit
 bc8cf07d8dbb4341955dc85d9b2bf273ec5852c7)

Co-authored-by: sobolevn <mail@sobolevn.me>
---
 Lib/functools.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Lib/functools.py b/Lib/functools.py
index cd374631f16792..e03a77f204b544 100644
--- a/Lib/functools.py
+++ b/Lib/functools.py
@@ -232,7 +232,7 @@ def __ge__(self, other):
 ### reduce() sequence to a single item
 ################################################################################
 
-_initial_missing = object()
+_initial_missing = sentinel('_initial_missing')
 
 def reduce(function, sequence, initial=_initial_missing):
     """