[3.11] gh-75367: Fix data descriptor detection in inspect.getattr_static (GH-104517) (#104557)

gh-75367: Fix data descriptor detection in inspect.getattr_static (GH-104517)
(cherry picked from commit 5e9f471)

Co-authored-by: Furkan Onder <furkanonder@protonmail.com>
Co-authored-by: Carl Meyer <carl@oddbird.net>

Author: 3 people

Lib/inspect.py

@@ -1829,8 +1829,10 @@ def getattr_static(obj, attr, default=_sentinel):
     klass_result = _check_class(klass, attr)
 
     if instance_result is not _sentinel and klass_result is not _sentinel:
-        if (_check_class(type(klass_result), '__get__') is not _sentinel and
-            _check_class(type(klass_result), '__set__') is not _sentinel):
+        if _check_class(type(klass_result), "__get__") is not _sentinel and (
+            _check_class(type(klass_result), "__set__") is not _sentinel
+            or _check_class(type(klass_result), "__delete__") is not _sentinel
+        ):
             return klass_result
 
     if instance_result is not _sentinel:

Lib/test/test_inspect.py

@@ -1993,6 +1993,9 @@ class Foo(object):
         descriptor.__set__ = lambda s, i, v: None
         self.assertEqual(inspect.getattr_static(foo, 'd'), Foo.__dict__['d'])
 
+        del descriptor.__set__
+        descriptor.__delete__ = lambda s, i, o: None
+        self.assertEqual(inspect.getattr_static(foo, 'd'), Foo.__dict__['d'])
 
     def test_metaclass_with_descriptor(self):
         class descriptor(object):

Misc/NEWS.d/next/Library/2023-05-16-11-02-44.gh-issue-75367.qLWR35.rst

@@ -0,0 +1 @@
+Fix data descriptor detection in  :func:`inspect.getattr_static`.