code: def rename(df, **kwargs):
      
  
      return df.rename(columns={v: k for k, v in kwargs.items()})
docs: Renames columns, where keyword argument values are the current names
      of columns and keys are the new names.
  
      Args:
          df (:obj:`pandas.DataFrame`): DataFrame passed in via `>>` pipe.
  
      Kwargs:
          **kwargs: key:value pairs where keys are new names for columns and
              values are current names of columns.