code: def test_rename(self, float_frame):
      mapping = {"A": "a", "B": "b", "C": "c", "D": "d"}
  
      renamed = float_frame.rename(columns=mapping)
      renamed2 = float_frame.rename(columns=str.lower)
  
      tm.assert_frame_equal(renamed, renamed2)
      tm.assert_frame_equal(
          renamed2.rename(columns=str.upper),
          float_frame,
          check_names=False,
      )
  
      # index
      data = {"A": {"foo": 0, "bar": 1}}
  
      df = DataFrame(data)
      renamed = df.rename(index={"foo": "bar", "bar": "foo"})
      tm.assert_index_equal(renamed.index, Index(["bar", "foo"]))
  
      renamed = df.rename(index=str.upper)
      tm.assert_index_equal(renamed.index, Index(["FOO", "BAR"]))
  
      # have to pass something
      with pytest.raises(
          TypeError, match="must pass an index to rename"
      ):
          float_frame.rename()
  
      # partial columns
      renamed = float_frame.rename(columns={"C": "foo", "D": "bar"})
      tm.assert_index_equal(
          renamed.columns, Index(["A", "B", "foo", "bar"])
      )
  
      # other axis
      renamed = float_frame.T.rename(index={"C": "foo", "D": "bar"})
      tm.assert_index_equal(
          renamed.index, Index(["A", "B", "foo", "bar"])
      )
  
      # index with name
      index = Index(["foo", "bar"], name="name")
      renamer = DataFrame(data, index=index)
      renamed = renamer.rename(index={"foo": "bar", "bar": "foo"})
      tm.assert_index_equal(
          renamed.index, Index(["bar", "foo"], name="name")
      )
      assert renamed.index.name == renamer.index.name
  
imports: from collections import ChainMap
  import inspect
  import numpy
  import pytest
  from pandas import DataFrame, Index, MultiIndex, merge
  import pandas._testing
label_desc: Use image node_id 3 for calling the TestRename obj's underlying member method code with example usage: obj.test_rename(float_frame) without return types