GeezerVison

diff --git a/Lib/inspect.py b/Lib/inspect.py
index a317f0ca74..7fcaa13750 100644
--- a/Lib/inspect.py
+++ b/Lib/inspect.py
@@ -1787,8 +1787,10 @@ def _check_instance(obj, attr):

 def _check_class(klass, attr):
     for entry in _static_getmro(klass):
-        if _shadowed_dict(type(entry)) is _sentinel and attr in entry.__dict__:
-            return entry.__dict__[attr]
+        if _shadowed_dict(type(entry)) is _sentinel:
+            ret = entry.__dict__.get(attr, _sentinel)
+            if ret is not _sentinel:
+                return ret
     return _sentinel

 def _is_type(obj):
@@ -1800,13 +1802,13 @@ def _is_type(obj):

 def _shadowed_dict(klass):
     for entry in _static_getmro(klass):
-        dunder_dict = _get_dunder_dict_of_class(entry)
-        if '__dict__' in dunder_dict:
-            class_dict = dunder_dict['__dict__']
-            if not (type(class_dict) is types.GetSetDescriptorType and
-                    class_dict.__name__ == "__dict__" and
-                    class_dict.__objclass__ is entry):
-                return class_dict
+        class_dict = _get_dunder_dict_of_class(entry).get('__dict__', _sentinel)
+        if class_dict is not _sentinel and not (
+            type(class_dict) is types.GetSetDescriptorType
+            and class_dict.__name__ == "__dict__"
+            and class_dict.__objclass__ is entry
+        ):
+            return class_dict
     return _sentinel

 def getattr_static(obj, attr, default=_sentinel):
@@ -1845,11 +1847,10 @@ def getattr_static(obj, attr, default=_sentinel):
     if obj is klass:
         # for types we check the metaclass too
         for entry in _static_getmro(type(klass)):
-            if (
-                _shadowed_dict(type(entry)) is _sentinel
-                and attr in entry.__dict__
-            ):
-                return entry.__dict__[attr]
+            if _shadowed_dict(type(entry)) is _sentinel:
+                ret = entry.__dict__.get(attr, _sentinel)
+                if ret is not _sentinel:
+                    return ret