Docs: simplify `turtle` tutorial's star example code (#155232)

https://github.com/python/cpython/commit/7c072c1fcc3c04535dde873a7709781be2794583
commit: 7c072c1fcc3c04535dde873a7709781be2794583
branch: main
author: Maciej Olko <[email protected]>
committer: StanFromIreland <[email protected]>
date: 2026-08-11T15:38:42+01:00
summary:

Docs: simplify `turtle` tutorial's star example code (#155232)

Co-authored-by: Stan Ulbrych <[email protected]>

files:
M Doc/library/turtle.rst

diff --git a/Doc/library/turtle.rst b/Doc/library/turtle.rst
index d7839e2f81172c..49099aea4152c1 100644
--- a/Doc/library/turtle.rst
+++ b/Doc/library/turtle.rst
@@ -79,8 +79,8 @@ In a Python shell, import all the objects of the ``turtle`` module::
 
     from turtle import *
 
-If you run into a ``No module named '_tkinter'`` error, you'll have to
-install the :mod:`Tk interface package <tkinter>` on your system.
+If you run into a ``Standard library module '_tkinter' was not found`` error,
+you'll have to install the :mod:`Tk interface package <tkinter>` on your system.
 
 
 Basic drawing
@@ -167,14 +167,16 @@ filling can be turned on and off::
 
 Next we'll create a loop::
 
+    start = pos()
+
     while True:
         forward(200)
         left(170)
-        if abs(pos()) < 1:
+        if distance(start) < 1:
             break
 
-``abs(pos()) < 1`` is a good way to know when the turtle is back at its
-home position.
+``distance(start) < 1`` is a good way to know when the turtle is back at its
+start position.
 
 Finally, complete the filling::
 

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