10-多个属性值的问题
from bs4 import BeautifulSoup
soup = BeautifulSoup('<a></a><b class="boldest bai">中间内容</b>', 'html5lib')
print(soup.b)
print(soup.a)
print(soup.b["class"])
print(soup.b["class"][0])
print(soup.b["class"][1])
print(soup.b.get("class")[1])Code language: PHP (php)输出结果：
<b class="boldest bai">中间内容</b>
<a></a>
['boldest', 'bai']
boldest
bai
baiCode language: HTML, XML (xml)说明：class 属性在 HTML 模式下返回的是列表，可以通过索引或 get() 方法逐值访问。
11-格式化成标准HTML
有些时候，我们可能获得的 html 不是标准的 html 文档，比如缺少结束标记。这时候 BeautifulSoup 可以帮我们把 html 文档格式化为标准文档。
比如这样：
from bs4 import BeautifulSoup
soup = BeautifulSoup('<a></a><b class="boldest bai">中间内容</b>', 'html5lib')
print(soup.html)Code language: HTML, XML (xml)本身是没有 html 标签的，但是我们却可以输出 html 对象。
最后输出：
<html><head></head><body><a></a><b class="boldest bai">中间内容</b></body></html>Code language: HTML, XML (xml)就算我们的 html 是不完整的，比如缺少了结束标记，也可以正常解析：
from bs4 import BeautifulSoup
soup = BeautifulSoup('<a><b class="boldest bai">中间内容<b>', 'html5lib')
print(soup)Code language: HTML, XML (xml)12-一个例子
我们看一个例子，例子中有一段不完整的 html，bs 会帮我们把不完整的文档补充完整。然后我们来获取 title 以及 title 的内容，还可以获取多个，获取标签中的属性。
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="story">...</p>
"""
soup = BeautifulSoup(html_doc, 'html5lib')
print(soup.title)
# <title>The Dormouse's story</title>
print(soup.title.name)
# title
print(soup.title.string)
# The Dormouse's story
print(soup.title.parent.name)
# head
print(soup.p)
# <p class="title"><b>The Dormouse's story</b></p>
print(soup.p['class'])
# ['title']
print(soup.a)
# <a class="sister" href="http://example.com/elsie" id="link1">Elsie</a>
print(soup.find_all('a'))
# [<a class="sister" href="http://example.com/elsie" id="link1">Elsie</a>,
# <a class="sister" href="http://example.com/lacie" id="link2">Lacie</a>,
# <a class="sister" href="http://example.com/tillie" id="link3">Tillie</a>]
print(soup.find(id="link3"))
# <a class="sister" href="http://example.com/tillie" id="link3">Tillie</a>Code language: HTML, XML (xml)从文档中找到所有 <a> 标签的链接：
for link in soup.find_all('a'):
print(link.get('href'))
# http://example.com/elsie
# http://example.com/lacie
# http://example.com/tillieCode language: PHP (php)从文档中获取所有文字内容：
print(soup.get_text())
# The Dormouse's story
#
# The Dormouse's story
#
# Once upon a time there were three little sisters; and their names were
# Elsie,
# Lacie and
# Tillie;
# and they lived at the bottom of a well.
#
# ...Code language: PHP (php)Previous: 关于警告
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