C/Python discrepancy: __parent__ as a class attribute fails in Python, works in C about extensionclass HOT 1 CLOSED

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modified: src/ExtensionClass/__init__.py
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@@ -223,14 +223,14 @@ class ExtensionClass(type):
 # to care or worry about using super(): it's always object.

 def Base_getattro(self, name):
-    descr = None
+    descr = marker = object()

     for base in type(self).__mro__:
         if name in base.__dict__:
             descr = base.__dict__[name]
             break

-    if descr is not None and inspect.isdatadescriptor(descr):
+    if descr is not marker and inspect.isdatadescriptor(descr):
         return descr.__get__(self, type(self))

     try:
@@ -245,16 +245,17 @@ def Base_getattro(self, name):
             if name == '__parent__' or not isinstance(descr, Base):
                 return descr

-    if descr is not None:
-        descr_get = getattr(descr, '__get__', None)
-        if descr_get is None:
+    if descr is not marker:
+        descr_get = getattr(descr, '__get__', marker)
+        if descr_get is marker:
             return descr

         return descr_get(self, type(self))

     raise AttributeError(
-            "'%.50s' object has not attribute '%s'",
-            type(self).__name__, name)
+        "'%.50s' object has no attribute '%s'" % (
+            type(self).__name__, name
+        ))


 def _slotnames(self):