我想在xpath内将一个值设置为x/ tr[x]

//tr[x]

import lxml.etree as ET

# 解析XML文档
tree = ET.parse('example.xml')

# 选择并修改节点的值
x = 2  # 设置x的值
node = tree.xpath('//tr[{}]'.format(x))[0]
node.text = 'new value'

# 保存修改后的XML文档
tree.write('example.xml')

import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.xpath.*;

import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

// 解析XML文档
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = factory.newDocumentBuilder();
Document doc = builder.parse(new File("example.xml"));

// 创建XPath对象
XPathFactory xpathFactory = XPathFactory.newInstance();
XPath xpath = xpathFactory.newXPath();

// 设置x的值
int x = 2;

// 选择并修改节点的值
String expression = String.format("//tr[%d]", x);
NodeList nodes = (NodeList) xpath.evaluate(expression, doc, XPathConstants.NODESET);
Node node = nodes.item(0);
node.setTextContent("new value");

// 保存修改后的XML文档
TransformerFactory transformerFactory = TransformerFactory.newInstance();
Transformer transformer = transformerFactory.newTransformer();
transformer.transform(new DOMSource(doc), new StreamResult(new File("example.xml")));