taobao.item.quantity.update 宝贝/SKU库存修改
        
        提供按照全量或增量形式修改宝贝/SKU库存的功能

def quantity_update(self, num_iid, quantity, session, sku_id=None, outer_id=None, aType=None):
        '''taobao.item.quantity.update 宝贝/SKU库存修改
        
        提供按照全量或增量形式修改宝贝/SKU库存的功能'''
        request = TOPRequest('taobao.item.quantity.update')
        request['num_iid'] = num_iid
        request['quantity'] = quantity
        if sku_id!=None:
            request['sku_id'] = sku_id
        if outer_id!=None:
            request['outer_id'] = outer_id
        if aType!=None:
            request['type'] = aType
        self.create(self.execute(request, session)['item'])
        return self