gh-75367: Fix data descriptor detection in inspect.getattr_static (#104517)

Co-authored-by: Carl Meyer <carl@oddbird.net>

2 files changed, 7 insertions, 2 deletions

diff --git a/Lib/inspect.py b/Lib/inspect.py
index a64e85e4fd..63f5aa91d2 100644
--- a/Lib/inspect.py
+++ b/Lib/inspect.py
@@ -1835,8 +1835,10 @@ 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:
diff --git a/Lib/test/test_inspect.py b/Lib/test/test_inspect.py
index 364f75db90..0590e49d0e 100644
--- a/Lib/test/test_inspect.py
+++ b/Lib/test/test_inspect.py
@@ -2052,6 +2052,9 @@ class TestGetattrStatic(unittest.TestCase):
         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):