code: def translate_sites(self, indices, vector, frac_coords=True,
                          to_unit_cell=True):
          
          if not isinstance(indices, collections.abc.Iterable):
              indices = [indices]
  
          for i in indices:
              site = self._sites[i]
              if frac_coords:
                  fcoords = site.frac_coords + vector
              else:
                  fcoords = self._lattice.get_fractional_coords(
                      site.coords + vector)
              if to_unit_cell:
                  fcoords = np.mod(fcoords, 1)
              self._sites[i].frac_coords = fcoords
docs: Translate specific sites by some vector, keeping the sites within the
          unit cell.
  
          Args:
              indices: Integer or List of site indices on which to perform the
                  translation.
              vector: Translation vector for sites.
              frac_coords (bool): Whether the vector corresponds to fractional or
                  cartesian coordinates.
              to_unit_cell (bool): Whether new sites are transformed to unit
                  cell