def get(self, session, discount_id=None, ext_fields=None):
        '''taobao.fenxiao.discounts.get 获取折扣信息
        
        查询折扣信息'''
        request = TOPRequest('taobao.fenxiao.discounts.get')
        if discount_id!=None: request['discount_id'] = discount_id
        if ext_fields!=None: request['ext_fields'] = ext_fields
        self.create(self.execute(request, session))
        return self.discounts