code: def test_lazy_tractogram_getitem(self):
      with pytest.raises(NotImplementedError):
          DATA["lazy_tractogram"][0]
  
imports: import copy
  import operator
  import sys
  import unittest
  import warnings
  from collections import defaultdict
  import numpy
  import pytest
  from numpy.testing import assert_array_almost_equal, assert_array_equal
  from ...testing import assert_arrays_equal, clear_and_catch_warnings
  from ..None import tractogram
  from ..tractogram import LazyDict, LazyTractogram, PerArrayDict, PerArraySequenceDict, Tractogram, TractogramItem, is_data_dict, is_lazy_dict
label_desc: Use image node_id 3 for calling the TestLazyTractogram obj's underlying member method code with example usage: obj.test_lazy_tractogram_getitem() without return types