taobao.traderates.search 商品评价查询接口
        
        通过商品id查询对应的评价信息

def search(self, num_iid, seller_nick, page_no=1, page_size=20):
        '''taobao.traderates.search 商品评价查询接口
        
        通过商品id查询对应的评价信息'''
        request = TOPRequest('taobao.traderates.search')
        request['num_iid'] = num_iid
        request['seller_nick'] = seller_nick
        request['page_no'] = page_no
        request['page_size'] = page_size
        self.create(self.execute(request))
        return self.trade_rates