code: def getAccountBalance(self):
      url = "https://www.bitstamp.net/api/balance/"
      jsonResponse = self._post(url, {})
      return AccountBalance(jsonResponse)
  
imports: import time
  import datetime
  import hmac
  import hashlib
  import requests
  import threading
  from pyalgotrade.utils import dt
  from pyalgotrade.bitstamp import common
  import logging
label_desc: Use image node_id 4 for calling the HTTPClient obj's underlying member method code with example usage: obj.getAccountBalance() and returns: AccountBalance