descriptor; if it defines neither, it is a non-data descriptor. Normally, data
descriptors define both :meth:`__get__` and :meth:`__set__`, while non-data
descriptors have just the :meth:`__get__` method. Data descriptors with
-:meth:`__set__` and :meth:`__get__` defined always override a redefinition in an
+:meth:`__get__` and :meth:`__set__` (and/or :meth:`__delete__`) defined always override a redefinition in an
instance dictionary. In contrast, non-data descriptors can be overridden by
instances.