From d5a9a57313627c1f1a106e11065ac1689a37da56 Mon Sep 17 00:00:00 2001
From: Serhiy Storchaka <storchaka@gmail.com>
Date: Tue, 4 Feb 2025 16:25:49 +0200
Subject: [PATCH] gh-128772: Fix pydoc for methods with __module__ is None
 (GH-129177) (cherry picked from commit
 979d76620990e6f8d68fa63e0ae0db1ec5b4d14c)

Co-authored-by: Serhiy Storchaka <storchaka@gmail.com>
---
 Lib/pydoc.py                                              | 2 +-
 Lib/test/test_pydoc/module_none.py                        | 8 ++++++++
 Lib/test/test_pydoc/test_pydoc.py                         | 5 +++++
 .../2025-01-22-13-29-06.gh-issue-128772.6YrxYM.rst        | 2 ++
 4 files changed, 16 insertions(+), 1 deletion(-)
 create mode 100644 Lib/test/test_pydoc/module_none.py
 create mode 100644 Misc/NEWS.d/next/Library/2025-01-22-13-29-06.gh-issue-128772.6YrxYM.rst

diff --git a/Lib/pydoc.py b/Lib/pydoc.py
index 1a527b2c307b68..591d7bc8f865cf 100755
--- a/Lib/pydoc.py
+++ b/Lib/pydoc.py
@@ -242,7 +242,7 @@ def parentname(object, modname):
     if necessary) or module."""
     if '.' in object.__qualname__:
         name = object.__qualname__.rpartition('.')[0]
-        if object.__module__ != modname:
+        if object.__module__ != modname and object.__module__ is not None:
             return object.__module__ + '.' + name
         else:
             return name
diff --git a/Lib/test/test_pydoc/module_none.py b/Lib/test/test_pydoc/module_none.py
new file mode 100644
index 00000000000000..ebb50fc86e2cf7
--- /dev/null
+++ b/Lib/test/test_pydoc/module_none.py
@@ -0,0 +1,8 @@
+def func():
+    pass
+func.__module__ = None
+
+class A:
+    def method(self):
+        pass
+    method.__module__ = None
diff --git a/Lib/test/test_pydoc/test_pydoc.py b/Lib/test/test_pydoc/test_pydoc.py
index 9cc2252e29367d..00ec3cdb3d49e5 100644
--- a/Lib/test/test_pydoc/test_pydoc.py
+++ b/Lib/test/test_pydoc/test_pydoc.py
@@ -1875,6 +1875,11 @@ def a_fn_with_https_link():
             html
         )
 
+    def test_module_none(self):
+        # Issue #128772
+        from test.test_pydoc import module_none
+        pydoc.render_doc(module_none)
+
 
 class PydocFodderTest(unittest.TestCase):
     def tearDown(self):
diff --git a/Misc/NEWS.d/next/Library/2025-01-22-13-29-06.gh-issue-128772.6YrxYM.rst b/Misc/NEWS.d/next/Library/2025-01-22-13-29-06.gh-issue-128772.6YrxYM.rst
new file mode 100644
index 00000000000000..53d6b3ccaffda8
--- /dev/null
+++ b/Misc/NEWS.d/next/Library/2025-01-22-13-29-06.gh-issue-128772.6YrxYM.rst
@@ -0,0 +1,2 @@
+Fix :mod:`pydoc` for methods with the ``__module__`` attribute equal to
+``None``.