code: def squeeze(self, axis=None):
          
          if axis is None:
              rng = range(self.ndim)
          else:
              rng = list(np.atleast_1d(np.arange(self.ndim)[axis]))
  
          new_indcs = [i for i in range(self.ndim)
                       if i not in rng or self.nondegen_byaxis[i]]
          coord_vecs = [self.coord_vectors[axis] for axis in new_indcs]
          return RectGrid(*coord_vecs)
docs: Return the grid with removed degenerate (length 1) dimensions.
  
          Parameters
          ----------
          axis : None or index expression, optional
              Subset of the axes to squeeze. Default: All axes.
  
          Returns
          -------
          squeezed : `RectGrid`
              Squeezed grid.
  
          Examples
          --------
          >>> g = RectGrid([0, 1], [-1], [-1, 0, 2])
          >>> g.squeeze()
          RectGrid(
              [ 0.,  1.],
              [-1.,  0.,  2.]
          )