duh!.py

class EntityClassTransactions(NamespaceExtension):

    __slots__ = NamespaceExtension.__slots__

    def __init__(self, name, instance):
        NamespaceExtension.__init__(self, name, instance)
        d = self._d
        for t_name in instance._t_selectionmethod_names:
            func = getattr(instance, t_name)
            name = t_name[2:]
            d[name] = func

        def __iter__(self):
            hidden = self._i._hidden_actions
            return (k for k, v in self._d.iteritems()
                    if (k not in hidden
                        and isselectionmethod(v)
                        )
                    )