code: def getFrequency(self):
      return bar.Frequency.TRADE
  
imports: import datetime
  import time
  from six.moves import queue
  from pyalgotrade import bar
  from pyalgotrade import barfeed
  from pyalgotrade import observer
  from pyalgotrade.bitstamp import common
  from pyalgotrade.bitstamp import wsclient
label_desc: Use image node_id 6 for calling the TradeBar obj's underlying member method code with example usage: obj.getFrequency() and returns: bar