code: def get_duplicates(self):
          
          warnings.warn("'get_duplicates' is deprecated and will be removed in "
                        "a future release. You can use "
                        "idx[idx.duplicated()].unique() instead",
                        FutureWarning, stacklevel=2)
  
          return self[self.duplicated()].unique()
docs: Extract duplicated index elements.
  
          .. deprecated:: 0.23.0
              Use idx[idx.duplicated()].unique() instead
  
          Returns a sorted list of index elements which appear more than once in
          the index.
  
          Returns
          -------
          array-like
              List of duplicated indexes.
  
          See Also
          --------
          Index.duplicated : Return boolean array denoting duplicates.
          Index.drop_duplicates : Return Index with duplicates removed.
  
          Examples
          --------
  
          Works on different Index of types.
  
          >>> pd.Index([1, 2, 2, 3, 3, 3, 4]).get_duplicates()  # doctest: +SKIP
          [2, 3]
  
          Note that for a DatetimeIndex, it does not return a list but a new
          DatetimeIndex:
  
          >>> dates = pd.to_datetime(['2018-01-01', '2018-01-02', '2018-01-03',
          ...                         '2018-01-03', '2018-01-04', '2018-01-04'],
          ...                        format='%Y-%m-%d')
          >>> pd.Index(dates).get_duplicates()  # doctest: +SKIP
          DatetimeIndex(['2018-01-03', '2018-01-04'],
                        dtype='datetime64[ns]', freq=None)
  
          Sorts duplicated elements even when indexes are unordered.
  
          >>> pd.Index([1, 2, 3, 2, 3, 4, 3]).get_duplicates()  # doctest: +SKIP
          [2, 3]
  
          Return empty array-like structure when all elements are unique.
  
          >>> pd.Index([1, 2, 3, 4]).get_duplicates()  # doctest: +SKIP
          []
          >>> dates = pd.to_datetime(['2018-01-01', '2018-01-02', '2018-01-03'],
          ...                        format='%Y-%m-%d')
          >>> pd.Index(dates).get_duplicates()  # doctest: +SKIP
          DatetimeIndex([], dtype='datetime64[ns]', freq=None)