From 5c984ae35e30f0533e6cc727d23cc158decf001c Mon Sep 17 00:00:00 2001
From: Serhiy Storchaka <storchaka@gmail.com>
Date: Thu, 3 Jul 2025 13:39:14 +0300
Subject: [PATCH] gh-133740: Fix regression in locale.nl_langinfo(ALT_DIGITS)
 (GH-136237)

There is no need to temporary switch locale for items ALT_DIGITS and ERA
if the nl_langinfo() result is empty (most locales).
---
 Modules/_localemodule.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/Modules/_localemodule.c b/Modules/_localemodule.c
index c1f56008b7c..41e6d48b1db 100644
--- a/Modules/_localemodule.c
+++ b/Modules/_localemodule.c
@@ -692,7 +692,7 @@ _locale_nl_langinfo_impl(PyObject *module, int item)
             result = result != NULL ? result : "";
             char *oldloc = NULL;
             if (langinfo_constants[i].category != LC_CTYPE
-                && (
+                && *result && (
 #ifdef __GLIBC__
                     // gh-133740: Always change the locale for ALT_DIGITS and ERA
 #  ifdef ALT_DIGITS