From 8ed868db8f0275c17690a1703e406d240d9ce021 Mon Sep 17 00:00:00 2001
From: Stan Ulbrych <stan@python.org>
Date: Fri, 3 Apr 2026 16:19:30 +0100
Subject: [PATCH] gh-125895: Fix static asset location for
 `sphinx-notfound-page` (GH-147984) (cherry picked from commit
 80ab6d958a0e4aa322aaf96994c43cd637496be6)

Co-authored-by: Stan Ulbrych <stan@python.org>
---
 Doc/conf.py | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/Doc/conf.py b/Doc/conf.py
index f24a4d1fa1a3b8..78baab4ad1e941 100644
--- a/Doc/conf.py
+++ b/Doc/conf.py
@@ -570,6 +570,17 @@
 stable_abi_file = 'data/stable_abi.dat'
 threadsafety_file = 'data/threadsafety.dat'
 
+# Options for notfound.extension
+# -------------------------------
+
+if not os.getenv("READTHEDOCS"):
+    if language_code:
+        notfound_urls_prefix = (
+            f'/{language_code.replace("_", "-").lower()}/{version}/'
+        )
+    else:
+        notfound_urls_prefix = f'/{version}/'
+
 # Options for sphinxext-opengraph
 # -------------------------------