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

---
 Lib/pydoc.py                                                      | 2 +-
 Lib/test/test_pydoc/module_none.py                                | 8 ++++++++
 Lib/test/test_pydoc/test_pydoc.py                                 | 5 +++++
 .../next/Library/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 922946e..1839b88 100644
--- a/Lib/pydoc.py
+++ b/Lib/pydoc.py
@@ -245,7 +245,7 @@ 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 0000000..ebb50fc
--- /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 b02ba3a..0abd36c 100644
--- a/Lib/test/test_pydoc/test_pydoc.py
+++ b/Lib/test/test_pydoc/test_pydoc.py
@@ -1903,6 +1903,11 @@ foo
             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 0000000..53d6b3c
--- /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``.
-- 
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