向xpath添加变量

<bookstore>
  <book>
    <title>Harry Potter</title>
    <author>J.K. Rowling</author>
  </book>
  <book>
    <title>The Great Gatsby</title>
    <author>F. Scott Fitzgerald</author>
  </book>
</bookstore>

import lxml.etree as ET

# 创建XML解析器
parser = ET.XMLParser()

# 解析XML文档
tree = ET.parse('bookstore.xml', parser)

# 获取根节点
root = tree.getroot()

# 定义变量
author_name = "J.K. Rowling"

# 构建xpath表达式，使用变量
xpath_expr = f"//book[author='{author_name}']/title"

# 使用xpath表达式提取数据
titles = root.xpath(xpath_expr)

# 打印结果
for title in titles:
    print(title.text)

Harry Potter