def get_rdataset(self, rdclass, rdtype, covers=dns.rdatatype.NONE,
                     create=False):

        try:
            rds = self.find_rdataset(rdclass, rdtype, covers, create)
        except KeyError:
            rds = None
        return rds
Include any default options that all commands should accept here
dataset/ETHPy150Open catap/namebench/nb_third_party/dns/node.py/Node.get_rdataset--crossover with--dataset/ETHPy150Open AppScale/appscale/AppServer/lib/django-1.4/django/core/management/base.py/handle_default_options