code: def test_dtype_subclass(self, code: str) -> None:
      cls = type(np.dtype(code))
      alias = cls[Any]
      assert isinstance(alias, types.GenericAlias)
      assert alias.__origin__ is cls
  
imports: import functools
  import operator
  import pickle
  import sys
  import types
  from itertools import permutations
  from typing import Any
  from unittest import skipIf
  import pytest
  from pytest import raises
  from torch.testing._internal.common_utils import instantiate_parametrized_tests, parametrize, run_tests, subtest, TEST_WITH_TORCHDYNAMO, TestCase, xpassIfTorchDynamo
  import numpy
label_desc: Use image node_id 2 for calling the TestClassGetItem obj's underlying member method code with example usage: obj.test_dtype_subclass(code) without return types