From 4fb6a31bce36c8e04c0bda63f13467fc594b4425 Mon Sep 17 00:00:00 2001
From: Adorilson Bezerra <adorilson@gmail.com>
Date: Tue, 6 Jan 2026 21:42:11 +0000
Subject: [PATCH] gh-106318: Add example for str.index()  (#137023)

---
 Doc/library/stdtypes.rst | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/Doc/library/stdtypes.rst b/Doc/library/stdtypes.rst
index d77d73100201..5d64af43b698 100644
--- a/Doc/library/stdtypes.rst
+++ b/Doc/library/stdtypes.rst
@@ -2045,7 +2045,18 @@ expression support in the :mod:`re` module).
 .. method:: str.index(sub[, start[, end]])
 
    Like :meth:`~str.find`, but raise :exc:`ValueError` when the substring is
-   not found.
+   not found. For example:
+
+   .. doctest::
+
+      >>> 'spam, spam, spam'.index('eggs')
+      Traceback (most recent call last):
+        File "<python-input-0>", line 1, in <module>
+          'spam, spam, spam'.index('eggs')
+          ~~~~~~~~~~~~~~~~~~~~~~~~^^^^^^^^
+      ValueError: substring not found
+
+   See also :meth:`rindex`.
 
 
 .. method:: str.isalnum()
-- 
2.47.3