code: def __str__(self):
      return "%s - http://%s:%d/" % (
          type(self),
          self.http_addr,
          self.port,
      )
  
imports: import sys, os, getpass, logging, time, inspect, requests, json, pprint
  import h2o_test_utils
  from h2o_test_utils import log, log_rest
  import h2o_print
label_desc: Use image node_id 2 for calling the H2O obj's underlying member method code with example usage: obj.__str__() and returns: unknown