一般写法

from lxml import etreehtml = ''' <li class="tag_1">需要的内容1</li> <li class="tag_2">需要的内容2</li> <li class="tag_3">需要的内容3</li>'''selector = etree.HTML(html )contents = selector.xpath ( '//li[@class = "tag_1"]/text()')print(contents)

输出：
D:\Python\venv\Scripts\python.exe D:/Python/venv/test9.py
['需要的内容1']

Process finished with exit code 0

starts-with()可以获取类似标签的信息。

from lxml import etreehtml = ''' <li class="tag_1">需要的内容1</li> <li class="tag_2">需要的内容2</li> <li class="tag_3">需要的内容3</li>'''selector = etree.HTML(html )contents = selector.xpath ( '//li[starts-with(@class ,"tag")]/text()')for content in contents: print (content)

输出：
D:\Python\venv\Scripts\python.exe D:/Python/venv/test9.py
需要的内容1
需要的内容2
需要的内容3

Process finished with exit code 0
**