code: def test_reindex_columns_method(self):
      # GH 14992, reindexing over columns ignored method
      df = DataFrame(
          data=[[11, 12, 13], [21, 22, 23], [31, 32, 33]],
          index=[1, 2, 4],
          columns=[1, 2, 4],
          dtype=float,
      )
  
      # default method
      result = df.reindex(columns=range(6))
      expected = DataFrame(
          data=[
              [np.nan, 11, 12, np.nan, 13, np.nan],
              [np.nan, 21, 22, np.nan, 23, np.nan],
              [np.nan, 31, 32, np.nan, 33, np.nan],
          ],
          index=[1, 2, 4],
          columns=range(6),
          dtype=float,
      )
      tm.assert_frame_equal(result, expected)
  
      # method='ffill'
      result = df.reindex(columns=range(6), method="ffill")
      expected = DataFrame(
          data=[
              [np.nan, 11, 12, 12, 13, 13],
              [np.nan, 21, 22, 22, 23, 23],
              [np.nan, 31, 32, 32, 33, 33],
          ],
          index=[1, 2, 4],
          columns=range(6),
          dtype=float,
      )
      tm.assert_frame_equal(result, expected)
  
      # method='bfill'
      result = df.reindex(columns=range(6), method="bfill")
      expected = DataFrame(
          data=[
              [11, 11, 12, 13, 13, np.nan],
              [21, 21, 22, 23, 23, np.nan],
              [31, 31, 32, 33, 33, np.nan],
          ],
          index=[1, 2, 4],
          columns=range(6),
          dtype=float,
      )
      tm.assert_frame_equal(result, expected)
  
imports: from datetime import datetime, timedelta
  import inspect
  import numpy
  import pytest
  from pandas._libs.tslibs.timezones import dateutil_gettz
  from pandas.compat import IS64, is_platform_windows
  from pandas.compat.numpy import np_version_gt2
  import pandas
  from pandas import Categorical, CategoricalIndex, DataFrame, Index, MultiIndex, Series, date_range, isna
  import pandas._testing
  from pandas.api.types import CategoricalDtype
label_desc: Use image node_id 24 for calling the TestDataFrameSelectReindex obj's underlying member method code with example usage: obj.test_reindex_columns_method() without return types