code: def addValue(self, value):
      self.__values.append(value)
  
imports: import abc
  import six
  from pyalgotrade import dataseries
  from pyalgotrade.dataseries import bards
  from pyalgotrade import bar
  from pyalgotrade import resamplebase
label_desc: Use image node_id 2 for calling the AggFunGrouper obj's underlying member method code with example usage: obj.addValue(value) without return types