def using_unique_session(u):
    """
    A test to determine if the user of the application is using a unique 
    session. Each user is permitted one unique session (one session in the
    django_session table that has not yet expired). If the user exceeds
    this quota, this test fails, and the user will get bounced to the login
    url.

    Parameters:
        u - The user. May be anonymous or registered.

    Returns:
        True - the user is an AnonymousUser or the number of sessions open
               by the user is only 1 (one must be open to make the request)
        False - the user is registered and has more than one open session.
    """
    if u.is_anonymous() or u.is_superuser:
        return True

    sessions = Session.objects.all()
    count = 0
    for session in sessions:
        try:
            decoded = session.get_decoded()

            if '_auth_user_id' in decoded and decoded['_auth_user_id'] == u.id:
                if 'activity_time' in decoded and datetime.now() < decoded['activity_time']:
                    # delete this session of mine; it is dormant
                    Session.objects.filter(session_key=session.session_key).delete()
                else:
                    count += 1
        except SuspiciousOperation:
            logger.debug("SuspiciousOperation caught while checking the number of sessions a user has open. Session key: %s", session.session_key)

    # after counting all the open and active sessions, go back through
    # the session list and assign the session count to all web sessions
    # for this user. (do this for inactive sessions, too)
    for session in sessions:
        try:
            decoded = session.get_decoded()
            if '_auth_user_id' in decoded and decoded['_auth_user_id'] == u.id:
                websession = SessionStore(session_key=session.session_key)
                websession['count'] = count
                websession.save()
        except SuspiciousOperation:
            logger.debug("SuspiciousOperation caught while setting the session count on all user sessions. Session key: %s", session.session_key)

    return (count <= 1)
dataset/ETHPy150Open PublicMapping/DistrictBuilder/django/publicmapping/redistricting/views.py/using_unique_session/swapped operands of `<`