Remove all keys from the namespace

def delete_namespace(self):
        '''Remove all keys from the namespace

        '''
        conn = redis.Redis(connection_pool=self.pool)
        keys = conn.keys("%s*" % self._namespace_str)
        for i in xrange(0, len(keys), 10000):
            conn.delete(*keys[i:i+10000])
        logger.debug('tearing down %r', self._namespace_str)