目前我正在分析来自其他人的代码,现在我正在弄清楚BeautifulSoup.hyperlinks变量必须具备的内容.有谁知道这方面的文件？我在官方网站上找不到任何东西.问题是当我打印soup.hyperlinks时,下面的代码给出'None':
from bs4 import BeautifulSoup
html_doc = """
<html><head><title>The Dormouse's story</title></head>
<body>
<p class="title"><b>The Dormouse's story</b></p>
<p class="story">Once upon a time there were three little sisters; and their names were
<a href="http://example.com/elsie" class="sister" id="link1">Elsie</a>,
<a href="http://example.com/lacie" class="sister" id="link2">Lacie</a> and
<a href="http://example.com/tillie" class="sister" id="link3">Tillie</a>;
and they lived at the bottom of a well.</p>
<p class="intermezzo">this is a link: http://www.link.nl/
<a href="http://www.link.nl" title="link title" target="link target" class="link class">link label</a>
</p>
<p class="story">...</p>
"""
soup = BeautifulSoup(html_doc)
print soup.hyperlinks
我希望有人可以帮助我吗？