From: Raymond Hettinger <rhettinger@users.noreply.github.com>
Date: Sat, 18 May 2024 06:32:34 +0000 (-0500)
Subject: Minor improvements to the docs for itertools.tee() (gh-119135)
X-Git-Tag: v3.14.0a1~1885
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=81c3130c51a2b1504842cb1a93732cc03ddbbd79;p=thirdparty%2FPython%2Fcpython.git

Minor improvements to the docs for itertools.tee() (gh-119135)
---

diff --git a/Doc/library/itertools.rst b/Doc/library/itertools.rst
index a19baa3f0e43..6d3374889836 100644
--- a/Doc/library/itertools.rst
+++ b/Doc/library/itertools.rst
@@ -698,18 +698,19 @@ 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