Iterating through a DOM with BeautifulSoup/Python

问题

I have this 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>

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

回答1:

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 "-------"

prints:

Bla bla bla


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

Hope that helps.

来源：https://stackoverflow.com/questions/22496401/iterating-through-a-dom-with-beautifulsoup-python