如何乘以 XPATH 中的值? [英] How to multiply values in XPATH?

问题描述

假设我有一堆

<item price='n' sold='m'>
...
</item>

我想对每件商品进行价格 * 销售.我正在尝试

I want to do price * sold on each of the items. I am trying

'//item/(@price * @sold)' 

来自 python 中的 lxml，但我不断收到错误 'Invalid Expression'.xmllint 命令也会发生同样的情况.但同样的查询在 Oxygen xml 编辑器中有效.

from inside lxml in python, but I keep getting the error 'Invalid Expression'. The same happens with xmllint command too. But the same query works in Oxygen xml editor.

我如何使这项工作?

推荐答案

计算可以在 XPath 2.0 中完成，因为我已经更正了！

Calculations can be done in XPath 2.0 as I have been corrected!

如果您想选择价格低于或等于售价乘以 2 的所有商品，这是可能的.见下:http://en.wikipedia.org/wiki/XPath#Number_functions

If you want to select everything where the price is lower or equal than sold price times 2 it is possible. See next: http://en.wikipedia.org/wiki/XPath#Number_functions

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