GAE-检索最后一个条目(python)

我正试图从数据存储中获取最新的数据项。 我正试着用上面解释的方法 here 但我得到了目标 <__main__.Rep object at 0x075F1730>

模型是:

class Rep(db.Model):
    sent = db.StringProperty()
    time = db.DateTimeProperty(auto_now_add=True)

class Repeater(webapp.RequestHandler):
    def get(self):        
        reps = Rep()
        reps.sent = self.request.get('sentence')
        reps.put()

        s = self.request.get('sentence')             

        query = reps.all()
        last = query.order('-time').get()
        sentences = query

谢谢!