code: def __getattr__(self, name):
      return getattr(self.io, name)
  
imports: import ctypes
  import io
  import multiprocessing
  import os
  import pickle
  import platform
  import sys
  import unittest
  import mock
  from chainer import datasets
  from chainer.datasets import pickle_dataset
  from chainer import testing
  from chainer import utils
label_desc: Use image node_id 4 for calling the ReaderMock obj's underlying member method code with example usage: obj.__getattr__(name) and returns: getattr