@property
    def is_unspecified(self):
        return (self.network_address.is_unspecified and
                self.broadcast_address.is_unspecified)
select_related() also of course applies to entire lists, not just
dataset/ETHPy150Open Exa-Networks/exabgp/lib/exabgp/dep/ipaddress.py/_BaseNetwork.is_unspecified--crossover with--dataset/ETHPy150Open AppScale/appscale/AppServer/lib/django-1.4/tests/modeltests/select_related/tests.py/SelectRelatedTests.test_list_without_select_related