code: def getValue(self):
      ret = None
      if self.windowFull():
          values = self.getValues()
          if self.__useMin:
              ret = values.min()
          else:
              ret = values.max()
      return ret
  
file_path: pyalgotrade/pyalgotrade/technical/highlow.py
imports: from pyalgotrade import technical
label_desc: Use image node_id 2 for calling the HighLowEventWindow obj's underlying member method code with example usage: obj.getValue() and returns: ret