code: def is_valid_op(self, symmop):
          
          coords = self.centered_mol.cart_coords
          for site in self.centered_mol:
              coord = symmop.operate(site.coords)
              ind = find_in_coord_list(coords, coord, self.tol)
              if not (len(ind) == 1
                      and self.centered_mol[ind[0]].species
                      == site.species):
                  return False
          return True
docs: Check if a particular symmetry operation is a valid symmetry operation
          for a molecule, i.e., the operation maps all atoms to another
          equivalent atom.
  
          Args:
              symmop (SymmOp): Symmetry operation to test.
  
          Returns:
              (bool): Whether SymmOp is valid for Molecule.