code: def getDuration(self):
      return self.__lastDateTime - self.__highDateTime
  
file_path: pyalgotrade/pyalgotrade/stratanalyzer/drawdown.py
imports: from pyalgotrade import stratanalyzer
  import datetime
label_desc: Use image node_id 2 for calling the DrawDownHelper obj's underlying member method code with example usage: obj.getDuration() and returns: unknown