code: def isTradingDay(self, dateTime):
      return not merval_calendar.is_trading_day(dateTime)
  
imports: import sys
  import os
  import datetime
  import symbolsxml
  import merval_calendar
  import pyalgotrade.logger
  from pyalgotrade.barfeed import yahoofeed
label_desc: Use image node_id 2 for calling the MervalMissingDataVerifier obj's underlying member method code with example usage: obj.isTradingDay(dateTime) and returns: unknown