code: def __init__(self, url):
      super(WebSocketClientBase, self).__init__(url)
      self.__keepAliveMgr = None
      self.__connected = False
  
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 1 to create a new WebSocketClientBase object from inherited base classes: tornadoclient with example: obj = WebSocketClientBase(url)