code: def getValue(self):
      ret = None
      if self.windowFull():
          ret = hurst_exp(
              self.getValues(), self.__minLags, self.__maxLags
          )
      return ret
  
file_path: pyalgotrade/pyalgotrade/technical/hurst.py
imports: import numpy
  from pyalgotrade import technical
label_desc: Use image node_id 3 for calling the HurstExponentEventWindow obj's underlying member method code with example usage: obj.getValue() and returns: ret