At the PythonLabs meeting someone mentioned it would make Jim really
happy if one could delete the __dict__ attribute of an instance.  I
love to make Jim happy, so here goes...

- New-style objects now support deleting their __dict__.  This is for
  all intents and purposes equivalent to assigning a brand new empty
  dictionary, but saves space if the object is not used further.
diff --git a/Lib/test/test_descr.py b/Lib/test/test_descr.py
index 48d1138..b73025b 100644
--- a/Lib/test/test_descr.py
+++ b/Lib/test/test_descr.py
@@ -2261,12 +2261,7 @@
     cant(a, None)
     cant(a, [])
     cant(a, 1)
-    try:
-        del a.__dict__
-    except TypeError:
-        pass
-    else:
-        raise TestFailed, "shouldn't allow del %r.__dict__" % (a)
+    del a.__dict__ # Deleting __dict__ is allowed
     # Classes don't allow __dict__ assignment
     cant(C, {})