How to get all text between just two specified tag

问题:

html = """
...
<tt class="descname">all</tt>
<big>(</big>
<em>iterable</em>
<big>)</big>
<a class="headerlink" href="#all" title="Permalink to this definition">¶</a>
...
"""

I want to get all text between starting tag big upto before the first occurrence of a tag. This means if I take this example, then i must get (iterable) as a string.

回答1:

I would avoid nextSibling, as from your question, you want to include everything up until the next <a>, regardless of whether that is in a sibling, parent or child element.

Therefore I think the best approach is to find the node that is the next <a> element and loop recursively until then, adding each string as encountered. You may need to tidy up the below if your HTML is vastly different from the sample, but something like this should work:

from bs4 import BeautifulSoup
#by taking the `html` variable from the question.
html = BeautifulSoup(html)
firstBigTag = html.find_all('big')[0]
nextATag = firstBigTag.find_next('a')
def loopUntilA(text, firstElement):
    text += firstElement.string
    if (firstElement.next.next == nextATag):             
        return text
    else:
        #Using double next to skip the string nodes themselves
        return loopUntilA(text, firstElement.next.next)
targetString = loopUntilA('', firstBigTag)
print targetString

回答2:

An iterative approach.

from BeautifulSoup import BeautifulSoup as bs
from itertools import takewhile, chain

def get_text(html, from_tag, until_tag):
    soup = bs(html)
    for big in soup(from_tag):
        until = big.findNext(until_tag)
        strings = (node for node in big.nextSiblingGenerator() if getattr(node, 'text', '').strip())
        selected = takewhile(lambda node: node != until, strings)
        try:
            yield ''.join(getattr(node, 'text', '') for node in chain([big, next(selected)], selected))
        except StopIteration as e:
            pass

for text in get_text(html, 'big', 'a'):
    print text

回答3:

you can do like this :

from BeautifulSoup import BeautifulSoup
html = """
<tt class="descname">all</tt>
<big>(</big>
<em>iterable</em>
<big>)</big>
<a class="headerlink" href="test" title="Permalink to this definition"></a>
"""
soup = BeautifulSoup(html)
print soup.find('big').nextSibling.next.text

For details check dom traversing with BeautifulSoup from here

回答4:

>>> from BeautifulSoup import BeautifulSoup as bs
>>> parsed = bs(html)
>>> txt = []
>>> for i in parsed.findAll('big'):
...     txt.append(i.text)
...     if i.nextSibling.name != u'a':
...         txt.append(i.nextSibling.text)
...
>>> ''.join(txt)
u'(iterable)'