def _load_storage(self):
        try:
            path = getattr(settings, 'RBSSH_STORAGE_BACKEND',
                           self.DEFAULT_STORAGE)
        except ImportError:
            # We may not be running in the Django environment.
            path = self.DEFAULT_STORAGE

        i = path.rfind('.')
        module, class_name = path[:i], path[i + 1:]

        try:
            mod = __import__(module, {}, {}, [class_name])
        except ImportError as e:
            msg = 'Error importing SSH storage backend %s: "%s"' % (module, e)
            logging.critical(msg)
            raise ImproperlyConfigured(msg)

        try:
            self.storage = getattr(mod, class_name)(namespace=self.namespace)
        except Exception as e:
            msg = 'Error instantiating SSH storage backend %s: "%s"' % \
                  (module, e)
            logging.critical(msg)
            raise
Loads the storage backend.
dataset/ETHPy150Open reviewboard/reviewboard/reviewboard/ssh/client.py/SSHClient._load_storage