From a370eebdd9bcc18d39f9e5d886ddb91a2435033e Mon Sep 17 00:00:00 2001
From: "Miss Islington (bot)"
 <31488909+miss-islington@users.noreply.github.com>
Date: Sat, 18 May 2024 08:51:20 +0200
Subject: [3.12] Minor improvements to the docs for itertools.tee() (gh-119135)
 (gh-119137)

---
 Doc/library/itertools.rst | 21 +++++++++++----------
 1 file changed, 11 insertions(+), 10 deletions(-)

diff --git a/Doc/library/itertools.rst b/Doc/library/itertools.rst
index 183aa36..cf2bbf0 100644
--- a/Doc/library/itertools.rst
+++ b/Doc/library/itertools.rst
@@ -690,18 +690,19 @@ loops that truncate the stream.
 
         def tee(iterable, n=2):
             iterator = iter(iterable)
-            empty_link = [None, None]  # Singly linked list: [value, link]
-            return tuple(_tee(iterator, empty_link) for _ in range(n))
+            shared_link = [None, None]
+            return tuple(_tee(iterator, shared_link) for _ in range(n))
 
         def _tee(iterator, link):
-            while True:
-                if link[1] is None:
-                    try:
-                        link[:] = [next(iterator), [None, None]]
-                    except StopIteration:
-                        return
-                value, link = link
-                yield value
+            try:
+                while True:
+                    if link[1] is None:
+                        link[0] = next(iterator)
+                        link[1] = [None, None]
+                    value, link = link
+                    yield value
+            except StopIteration:
+                return
 
    Once a :func:`tee` has been created, the original *iterable* should not be
    used anywhere else; otherwise, the *iterable* could get advanced without
-- 
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