docs: def tag_atoms_unique_ids(self, force=False):
          """ Tags each Atom in the Assembly with its unique_id.
  
          Notes
          -----
          The unique_id for each atom is a tuple (a double). `unique_id[0]`
          is the unique_id for its parent `Monomer` (see `Monomer.unique_id`
          for more information). `unique_id[1]` is the atom_type in the
          `Assembly` as a string, e.g. 'CA', 'CD2'.
  
          Parameters
          ----------
          force : bool, optional
                  If True the tag will be run even if Atoms are already tagged.
                  If False, only runs if at least one Atom is not tagged.
  
          """
          tagged = ['unique_id' in x.tags.keys() for x in self.get_atoms()]
          if (not all(tagged)) or force:
              for m in self.get_monomers():
                  for atom_type, atom in m.atoms.items():
                      atom.tags['unique_id'] = (m.unique_id, atom_type)
          return