taobao.traderates.get 搜索评价信息
        
        搜索评价信息，只能获取距今180天内的评价记录

def get(self, rate_type, role, session, fields=[], **kwargs):
        '''taobao.traderates.get 搜索评价信息
        
        搜索评价信息，只能获取距今180天内的评价记录'''
        request = TOPRequest('taobao.traderates.get')
        request['rate_type'] = rate_type
        request['role'] = role
        if not fields:
            tradeRate = TradeRate()
            fields = tradeRate.fields
        request['fields'] = fields
        for k, v in kwargs.iteritems():
            if k not in ('result', 'page_no', 'page_size', 'start_date', 'end_date', 'tid') and v==None: continue
            request[k] = v
        self.create(self.execute(request, session))
        return self.trade_rates