code: def test_get_item_tensor_string(self):
      initial_str = custom_constant("abcd")
      t = slices.get_item(initial_str, 1, slices.GetItemOpts(None))
      self.assertEqual(t, "b")
  
      initial_list_str = custom_constant(["abcd", "bcde"])
      t = slices.get_item(initial_list_str, 1, slices.GetItemOpts(None))
      self.assertEqual(t, "bcde")
  
imports: import unittest
  from nvidia.dali._autograph.operators import slices
  from nvidia.dali._autograph.utils.all_utils import custom_constant
label_desc: Use image node_id 3 for calling the SlicesTest obj's underlying member method code with example usage: obj.test_get_item_tensor_string() without return types