code: def conform(self, frame, axis='items'):
          
          axes = self._get_plane_axes(axis)
          return frame.reindex(**self._extract_axes_for_slice(self, axes))
docs: Conform input DataFrame to align with chosen axis pair.
  
          Parameters
          ----------
          frame : DataFrame
          axis : {'items', 'major', 'minor'}
  
              Axis the input corresponds to. E.g., if axis='major', then
              the frame's columns would be items, and the index would be
              values of the minor axis
  
          Returns
          -------
          DataFrame