https://github.com/python/cpython/commit/d1882577a32125870c0bc8030d90221068b6b071
commit: d1882577a32125870c0bc8030d90221068b6b071
branch: 3.13
author: Miss Islington (bot) <[email protected]>
committer: ZeroIntensity <[email protected]>
date: 2025-08-18T15:05:12Z
summary:

[3.13] gh-44538: Mention nested classes/functions in doctest docs (GH-137870) 
(GH-137917)

gh-44538: Mention nested classes/functions in doctest docs (GH-137870)
(cherry picked from commit 138ed6db9f89171983dc32af4e7ad2e73d46a940)

Co-authored-by: Bartosz SÅ‚awecki <[email protected]>

files:
M Doc/library/doctest.rst

diff --git a/Doc/library/doctest.rst b/Doc/library/doctest.rst
index d1ccfc20981523..e6f89ea981acd8 100644
--- a/Doc/library/doctest.rst
+++ b/Doc/library/doctest.rst
@@ -346,6 +346,13 @@ searches them recursively for docstrings, which are then 
scanned for tests.
 Any classes found are recursively searched similarly, to test docstrings in
 their contained methods and nested classes.
 
+.. note::
+
+   ``doctest`` can only automatically discover classes and functions that are
+   defined at the module level or inside other classes.
+
+   Since nested classes and functions only exist when an outer function
+   is called, they cannot be discovered. Define them outside to make them 
visible.
 
 .. _doctest-finding-examples:
 

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