code: def getBarsFrequency(self):
      return str(self.__barsFreq)
  
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 3 for calling the Server obj's underlying member method code with example usage: obj.getBarsFrequency() and returns: str