code: def opened(self):
      self.__connected = True
      if self.__keepAliveMgr is not None:
          self.__keepAliveMgr.start()
          self.__keepAliveMgr.setAlive()
      self.onOpened()
  
imports: import json
  import time
  import threading
  import six
  from ws4py.client import tornadoclient
  import tornado
  import pyalgotrade.logger
label_desc: Use image node_id 6 for calling the WebSocketClientBase obj's underlying member method code with example usage: obj.opened() without return types