code: def test_astype_object2(self):
      idx = period_range(
          start="2013-01-01", periods=4, freq="M", name="idx"
      )
      expected_list = [
          Period("2013-01-31", freq="M"),
          Period("2013-02-28", freq="M"),
          Period("2013-03-31", freq="M"),
          Period("2013-04-30", freq="M"),
      ]
      expected = Index(expected_list, dtype=object, name="idx")
      result = idx.astype(object)
      assert isinstance(result, Index)
      assert result.dtype == object
      tm.assert_index_equal(result, expected)
      assert result.name == expected.name
      assert idx.tolist() == expected_list
  
      idx = PeriodIndex(
          ["2013-01-01", "2013-01-02", "NaT", "2013-01-04"],
          freq="D",
          name="idx",
      )
      expected_list = [
          Period("2013-01-01", freq="D"),
          Period("2013-01-02", freq="D"),
          Period("NaT", freq="D"),
          Period("2013-01-04", freq="D"),
      ]
      expected = Index(expected_list, dtype=object, name="idx")
      result = idx.astype(object)
      assert isinstance(result, Index)
      assert result.dtype == object
      tm.assert_index_equal(result, expected)
      for i in [0, 1, 3]:
          assert result[i] == expected[i]
      assert result[2] is NaT
      assert result.name == expected.name
  
      result_list = idx.tolist()
      for i in [0, 1, 3]:
          assert result_list[i] == expected_list[i]
      assert result_list[2] is NaT
  
file_path: pandas/pandas/tests/indexes/period/methods/test_astype.py
imports: import numpy
  import pytest
  from pandas import CategoricalIndex, DatetimeIndex, Index, NaT, Period, PeriodIndex, period_range
  import pandas._testing
label_desc: Use image node_id 5 for calling the TestPeriodIndexAsType obj's underlying member method code with example usage: obj.test_astype_object2() without return types