code: def __getitem__(self, item):
      return self.metafeature_values[item]
  
imports: from abc import ABCMeta, abstractmethod
  import time
  from io import StringIO
  import arff
  import scipy.sparse
label_desc: Use image node_id 8 for calling the DatasetMetafeatures obj's underlying member method code with example usage: obj.__getitem__(item) and returns: self