通过与BeautifulSoup / Python中的DOM遍历

问题描述

我有这样的DOM：

<h2>Main Section</h2>
<p>Bla bla bla<p>
<h3>Subsection</h3>
<p>Some more info</p>

<h3>Subsection 2</h3>
<p>Even more info!</p>


<h2>Main Section 2</h2>
<p>bla</p>
<h3>Subsection</h3>
<p>Some more info</p>

<h3>Subsection 2</h3>
<p>Even more info!</p>

我想生成返回主科，唧唧歪歪，分段等一个迭代器有没有办法将它与BeautifulSoup？

I'd like to generate an iterator that returns 'Main Section', 'Bla bla bla', 'Subsection', etc. Is there a way to this with BeautifulSoup?

推荐答案

下面是做到这一点的方法之一。我们的想法是遍历主要部分（ H2 标签），并为每个 H2 标记迭代的兄弟姐妹，直到明年 H2 标签：

Here's one way to do it. The idea is to iterate over main sections (h2 tag) and for every h2 tag iterate over siblings until next h2 tag:

from bs4 import BeautifulSoup, Tag


data = """<h2>Main Section</h2>
<p>Bla bla bla<p>
<h3>Subsection</h3>
<p>Some more info</p>

<h3>Subsection 2</h3>
<p>Even more info!</p>


<h2>Main Section 2</h2>
<p>bla</p>
<h3>Subsection</h3>
<p>Some more info</p>

<h3>Subsection 2</h3>
<p>Even more info!</p>"""


soup = BeautifulSoup(data)
for main_section in soup.find_all('h2'):
    for sibling in main_section.next_siblings:
        if not isinstance(sibling, Tag):
            continue
        if sibling.name == 'h2':
            break
        print sibling.text
    print "-------"

打印：

Bla bla bla


Subsection
Some more info
Subsection 2
Even more info!
-------
bla
Subsection
Some more info
Subsection 2
Even more info!
-------

希望有所帮助。

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