如何使用XPATH从重复片段中筛选字段？

<books>
  <book>
    <title>Book 1</title>
    <author>Author 1</author>
  </book>
  <book>
    <title>Book 2</title>
    <author>Author 2</author>
  </book>
  <book>
    <title>Book 3</title>
    <author>Author 3</author>
  </book>
</books>

from lxml import etree

# 加载XML文档
xml = '''
<books>
  <book>
    <title>Book 1</title>
    <author>Author 1</author>
  </book>
  <book>
    <title>Book 2</title>
    <author>Author 2</author>
  </book>
  <book>
    <title>Book 3</title>
    <author>Author 3</author>
  </book>
</books>
'''

root = etree.fromstring(xml)

# 执行XPATH查询
titles = root.xpath('//book/title')

# 处理筛选出的字段
for title in titles:
    print(title.text)

Book 1
Book 2
Book 3