code: def rename(self, names, inplace=False):
          
          if (type(names) is not dict):
              raise TypeError('names must be a dictionary: oldname -> newname')
          all_columns = set(self.column_names())
          for k in names:
              if not k in all_columns:
                  raise ValueError('Cannot find column %s in the SFrame' % k)
  
          if inplace:
              ret = self
          else:
              ret = self.copy()
  
          with cython_context():
              for k in names:
                  colid = ret.column_names().index(k)
                  ret.__proxy__.set_column_name(colid, names[k])
          ret._cache = None
          return ret
docs: Returns an SFrame with columns renamed. ``names`` is expected to be a
          dict specifying the old and new names. This changes the names of the
          columns given as the keys and replaces them with the names given as the
          values.
  
          If inplace == False (default) this operation does not modify the
          current SFrame, returning a new SFrame.
  
          If inplace == True, this operation modifies the current
          SFrame, returning self.
  
          Parameters
          ----------
          names : dict [string, string]
              Dictionary of [old_name, new_name]
  
          inplace : bool, optional. Defaults to False.
              Whether the SFrame is modified in place.
  
          Returns
          -------
          out : SFrame
              The current SFrame.
  
          See Also
          --------
          column_names
  
          Examples
          --------
          >>> sf = SFrame({'X1': ['Alice','Bob'],
          ...              'X2': ['123 Fake Street','456 Fake Street']})
          >>> res = sf.rename({'X1': 'name', 'X2':'address'})
          >>> res
          +-------+-----------------+
          |  name |     address     |
          +-------+-----------------+
          | Alice | 123 Fake Street |
          |  Bob  | 456 Fake Street |
          +-------+-----------------+
          [2 rows x 2 columns]