Beautiful Soup
Beautiful Soup is a Python package for parsing HTML and XML documents (including having malformed markup, i.e. non-closed tags, so named after tag soup). It creates a parse tree for parsed pages that can be used to extract data from HTML,[3] which is useful for web scraping.
Beautiful Soup 提供对 HTML 内容的细粒度控制，支持特定标签的提取、移除和内容清理。
它适用于需要提取特定信息并根据需求清理 HTML 内容的情况。
例如，我们可以从HTML内容中提取`<p>, <li>, <div>, and <a>`标签内的文本内容：
-
<p>: 段落标签。它在HTML中定义一个段落，并用于将相关的句子和/或短语组合在一起。 -
<li>: 列表项标签。它用于有序列表（<ol>）和无序列表（<ul>）中，以定义列表中的各个项目。 -
<div>: 分割标签。它是一个块级元素，用于将其他内联或块级元素分组。 -
<a>: 锚标签。它用于定义超链接。
from langchain_community.document_loaders import AsyncChromiumLoader
from langchain_community.document_transformers import BeautifulSoupTransformer
# Load HTML
loader = AsyncChromiumLoader(["https://www.wsj.com"])
html = loader.load()
# Transform
bs_transformer = BeautifulSoupTransformer()
docs_transformed = bs_transformer.transform_documents(
html, tags_to_extract=["p", "li", "div", "a"]
)
docs_transformed[0].page_content[0:500]
'Conservative legal activists are challenging Amazon, Comcast and others using many of the same tools that helped kill affirmative-action programs in colleges.1,2099 min read U.S. stock indexes fell and government-bond prices climbed, after Moody’s lowered credit ratings for 10 smaller U.S. banks and said it was reviewing ratings for six larger ones. The Dow industrials dropped more than 150 points.3 min read Penn Entertainment’s Barstool Sportsbook app will be rebranded as ESPN Bet this fall as '