def enable_put_in_removed_functions (self):
        """
        Reinstate the functions which were removed from list_observer and dict_observer.
        """
        for klass, attribute, function in self.removed_functions:
            setattr(klass, attribute, function)

        Reinstate the functions which were removed from list_observer and dict_observer.
        
recipes/Python/306866_A_basic_undo_mechanism/recipe-306866.py