code: def approx_equals(self, other, atol):
          
          if other is self:
              return True
  
          return (type(other) is type(self) and
                  self.ndim == other.ndim and
                  self.shape == other.shape and
                  all(np.allclose(vec_s, vec_o, atol=atol, rtol=0.0)
                      for (vec_s, vec_o) in zip(self.coord_vectors,
                                                other.coord_vectors)))
docs: Test if this grid is equal to another grid.
  
          Parameters
          ----------
          other :
              Object to be tested
          atol : float
              Allow deviations up to this number in absolute value
              per vector entry.
  
          Returns
          -------
          equals : bool
              ``True`` if ``other`` is a `RectGrid` instance with all
              coordinate vectors equal (up to the given tolerance), to
              the ones of this grid, ``False`` otherwise.
  
          Examples
          --------
          >>> g1 = RectGrid([0, 1], [-1, 0, 2])
          >>> g2 = RectGrid([-0.1, 1.1], [-1, 0.1, 2])
          >>> g1.approx_equals(g2, atol=0)
          False
          >>> g1.approx_equals(g2, atol=0.15)
          True