https://github.com/python/cpython/commit/6412d30e1e9e1cd789bea4351c18ab255d63b285
commit: 6412d30e1e9e1cd789bea4351c18ab255d63b285
branch: 3.15
author: Miss Islington (bot) <[email protected]>
committer: ZeroIntensity <[email protected]>
date: 2026-10-19T17:19:37Z
summary:

[3.15] Docs: Fix built-in function `__self__` attribute descriptions 
(GH-159653) (GH-159710)

Since PEP 3121, functions in C modules are bound to their module, so
their __self__ is the module object. The inspect.isbuiltin docstring,
the inspect attribute table and the data model reference still say
it is None, as it was in Python 2. Describe it as the module object
the function was defined in, or None.
(cherry picked from commit 415ebffc47e8303d61cf97faf4ddb474334d736d)

Co-authored-by: crypt0lith <[email protected]>

files:
M Doc/library/inspect.rst
M Doc/reference/datamodel.rst
M Lib/inspect.py

diff --git a/Doc/library/inspect.rst b/Doc/library/inspect.rst
index dc096b743c63343..118bf9b923ddf99 100644
--- a/Doc/library/inspect.rst
+++ b/Doc/library/inspect.rst
@@ -319,6 +319,8 @@ attributes (see :ref:`import-mod-attrs` for module 
attributes):
 +-----------------+-------------------+---------------------------+
 |                 | __self__          | instance to which a       |
 |                 |                   | method is bound, or       |
+|                 |                   | module object a function  |
+|                 |                   | was defined in, or        |
 |                 |                   | ``None``                  |
 +-----------------+-------------------+---------------------------+
 
diff --git a/Doc/reference/datamodel.rst b/Doc/reference/datamodel.rst
index 06176be88e07392..1af5301f51ef967 100644
--- a/Doc/reference/datamodel.rst
+++ b/Doc/reference/datamodel.rst
@@ -863,7 +863,8 @@ determined by the C function. Special read-only attributes:
 * :attr:`!__doc__` is the function's documentation string, or ``None`` if
   unavailable. See :attr:`function.__doc__`.
 * :attr:`!__name__` is the function's name. See :attr:`function.__name__`.
-* :attr:`!__self__` is set to ``None`` (but see the next item).
+* :attr:`!__self__` is the module object the function was defined in or
+  ``None`` if unavailable.
 * :attr:`!__module__` is the name of
   the module the function was defined in or ``None`` if unavailable.
   See :attr:`function.__module__`.
diff --git a/Lib/inspect.py b/Lib/inspect.py
index dfaa5843a1fb877..945f696bf0abe17 100644
--- a/Lib/inspect.py
+++ b/Lib/inspect.py
@@ -441,7 +441,8 @@ def isbuiltin(object):
     Built-in functions and methods provide these attributes:
         __doc__         documentation string
         __name__        original name of this function or method
-        __self__        instance to which a method is bound, or None"""
+        __self__        instance to which a method is bound, or module object
+                        a function was defined in, or None"""
     return isinstance(object, types.BuiltinFunctionType)
 
 def ismethodwrapper(object):

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