code: def update(self, session, **kwargs):
          '''taobao.fenxiao.discount.update 修改等级折扣
          
          修改等级折扣'''
          request = TOPRequest('taobao.fenxiao.discount.update')
          for k, v in kwargs.iteritems():
              if k not in ('discount_id', 'discount_name', 'discount_status', 'detail_ids', 'target_types', 'target_ids', 'discount_types', 'discount_values', 'detail_statuss') and v==None: continue
              request[k] = v
          self.create(self.execute(request, session), fields=['is_success',])
          return self.is_succesf update(self, session, **kwargs):
          '''taobao.fenxiao.discount.update 修改等级折扣
          
          修改等级折扣'''
          request = TOPRequest('taobao.fenxiao.discount.update')
          for k, v in kwargs.iteritems():
              if k not in ('discount_id', 'discount_name', 'discount_status', 'detail_ids', 'target_types', 'target_ids', 'discount_types', 'discount_values', 'detail_statuss') and v==None: continue
              request[k] = v
          self.create(self.execute(request, session), fields=['is_success',])
          return self.is_success
docs: taobao.fenxiao.discount.update 修改等级折扣
          
          修改等级折扣