Remove __metaclass__ remains.
diff --git a/Demo/newmetaclasses/Enum.py b/Demo/newmetaclasses/Enum.py
index 99b6fe8..3ff8ddd 100644
--- a/Demo/newmetaclasses/Enum.py
+++ b/Demo/newmetaclasses/Enum.py
@@ -82,11 +82,11 @@
     def __str__(self):
         return "%s.%s" % (self.__classname, self.__enumname)
 
-class Enum:
-    __metaclass__ = EnumMetaclass
+class Enum(metaclass=EnumMetaclass):
+    pass
 
-class FullEnum:
-    __metaclass__ = FullEnumMetaclass
+class FullEnum(metaclass=FullEnumMetaclass):
+    pass
 
 def _test():