一般写法

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

输出：

Process finished with exit code 0

starts-with()可以获取类似标签的信息。

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

输出：

Process finished with exit code 0