code: def waitServing(self, timeout=None):
      return self.__startedServingEvent.wait(timeout)
  
imports: import threading
  import time
  from six.moves import xmlrpc_server
  import pyalgotrade.logger
  from pyalgotrade.optimizer import base
  from pyalgotrade.optimizer import serialization
label_desc: Use image node_id 7 for calling the Server obj's underlying member method code with example usage: obj.waitServing(timeout) and returns: self