def run(self):
        """Remove old sessions from memory as needed.

        This method is executed by calling .start() on a SessionManager
        object. The "daemon" attribute may need be set to True before
        activating this feature. Please note that once this cleanup
        routine begins, it must run until the program terminates."""
        while True:
            time.sleep(self.__sleep_interval)
            with self:
                for key in tuple(self):
                    if not super().__getitem__(key):
                        del self[key]
Remove old sessions from memory as needed.

        This method is executed by calling .start() on a SessionManager
        object. The "daemon" attribute may need be set to True before
        activating this feature. Please note that once this cleanup
        routine begins, it must run until the program terminates.
recipes/Python/577048_Bible_Verse_Quiz__managerpy/recipe-577048.py