code: def test_astype_retain_attrs(self, any_numpy_dtype):
      # GH#44414
      df = DataFrame({"a": [0, 1, 2], "b": [3, 4, 5]})
      df.attrs["Location"] = "Michigan"
  
      result = df.astype({"a": any_numpy_dtype}).attrs
      expected = df.attrs
  
      tm.assert_dict_equal(expected, result)
  
imports: import re
  import numpy
  import pytest
  import pandas.util._test_decorators
  import pandas
  from pandas import Categorical, CategoricalDtype, DataFrame, DatetimeTZDtype, Index, Interval, IntervalDtype, NaT, Series, Timedelta, Timestamp, concat, date_range, option_context
  import pandas._testing
label_desc: Use image node_id 40 for calling the TestAstype obj's underlying member method code with example usage: obj.test_astype_retain_attrs(any_numpy_dtype) without return types