ids = partner_obj.search(cr, uid, [('membership_state', '=', 'paid'), ('membership_stop', '<', today)], context=None)
self.write(cr, uid, ids, {'membership_state': 'old'}, context=None)
ids = partner_obj.search(cr, uid, [('membership_state', '=', 'paid'), ('membership_stop', '<', today)], context=None)
self.write(cr, uid, ids, {'membership_state': 'old'}, context=None)