def list_subdomains_previous_page(self):
        uri = self._paging.get("subdomain", {}).get("prev_uri")
        if uri is None:
            raise exc.NoMoreResults("There are no previous pages of subdomains "
                    "to list.")
        return self._list_subdomains(uri)
Helper method to go through all commands and return all option names,
dataset/ETHPy150Open rackspace/pyrax/pyrax/clouddns.py/CloudDNSManager.list_subdomains_previous_page--crossover with--dataset/ETHPy150Open j-bennet/wharfee/wharfee/options.py/all_option_names