def get(self, fields=[], product_id=None, cid=None, props=None):
        '''taobao.product.get 获取一个产品的信息
        
        两种方式查看一个产品详细信息: 传入product_id来查询 传入cid和props来查询'''
        request = TOPRequest('taobao.product.get')
        if not fields:
            fields = self.fields
        request['fields'] = fields
        if product_id!=None: request['product_id'] = product_id
        if cid!=None: request['cid'] = cid
        if props!=None: request['props'] = props
        self.create(self.execute(request)['product'])
        return self