Retrieves the active, unexpired sessions.

        :Returns:
            A generator of :class:`~mwsessions.Session`

def get_active_sessions(self):
        """
        Retrieves the active, unexpired sessions.

        :Returns:
            A generator of :class:`~mwsessions.Session`

        """
        for last_timestamp, i, events in self.recently_active:
            yield Session(events[-1].user, unpack_events(events))