code: def test_assign_dtype_attribute(self, nfields):
      dt = np.dtype(
          [("a", np.uint8), ("b", np.uint8), ("c", np.uint8)][:nfields]
      )
      data = np.zeros(3, dt).view(np.recarray)
  
      # the original and resulting dtypes differ on whether they are records
      assert data.dtype.type == np.record
      assert dt.type != np.record
  
      # ensure that the dtype remains a record even when assigned
      data.dtype = dt
      assert data.dtype.type == np.record
  
imports: import collections.abc
  import textwrap
  from io import BytesIO
  from os import path
  from pathlib import Path
  import pytest
  import numpy
  from numpy.testing import assert_, assert_equal, assert_array_equal, assert_array_almost_equal, assert_raises, temppath
  from numpy.compat import pickle
label_desc: Use image node_id 15 for calling the TestRecord obj's underlying member method code with example usage: obj.test_assign_dtype_attribute(nfields) without return types