code: def test_drop_duplicates_categorical_non_bool_keeplast(
      self, cat_series_unused_category
  ):
      tc1 = cat_series_unused_category
  
      expected = Series([False, False, True, False])
  
      result = tc1.duplicated(keep="last")
      tm.assert_series_equal(result, expected)
  
      result = tc1.drop_duplicates(keep="last")
      tm.assert_series_equal(result, tc1[~expected])
  
      sc = tc1.copy()
      return_value = sc.drop_duplicates(keep="last", inplace=True)
      assert return_value is None
      tm.assert_series_equal(sc, tc1[~expected])
  
imports: import numpy
  import pytest
  import pandas
  from pandas import Categorical, Series
  import pandas._testing
label_desc: Use image node_id 4 for calling the TestSeriesDropDuplicates obj's underlying member method code with example usage: obj.test_drop_duplicates_categorical_non_bool_keeplast(cat_series_unused_category) without return types