用BeautifulSoup包装标签的内容 [英] wrap the contents of a tag with BeautifulSoup
本文介绍了用BeautifulSoup包装标签的内容的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我想用BeautifulSoup包装标签的内容. 这个:
I'm tring to wrap the contents of a tag with BeautifulSoup. This:
<div class="footnotes">
<p>Footnote 1</p>
<p>Footnote 2</p>
</div>
应该变成这样:
<div class="footnotes">
<ol>
<p>Footnote 1</p>
<p>Footnote 2</p>
</ol>
</div>
所以我使用以下代码:
footnotes = soup.findAll("div", { "class" : "footnotes" })
footnotes_contents = ''
new_ol = soup.new_tag("ol")
for content in footnotes[0].children:
new_tag = soup.new_tag(content)
new_ol.append(new_tag)
footnotes[0].clear()
footnotes[0].append(new_ol)
print footnotes[0]
但是我得到以下信息:
<div class="footnotes"><ol><
></
><<p>Footnote 1</p>></<p>Footnote 1</p>><
></
><<p>Footnote 2</p>></<p>Footnote 2</p>><
></
></ol></div>
建议?
推荐答案
使用lxml:
import lxml.html as LH
import lxml.builder as builder
E = builder.E
doc = LH.parse('data')
footnote = doc.find('//div[@class="footnotes"]')
ol = E.ol()
for tag in footnote:
ol.append(tag)
footnote.append(ol)
print(LH.tostring(doc.getroot()))
打印
<html><body><div class="footnotes">
<ol><p>Footnote 1</p>
<p>Footnote 2</p>
</ol></div></body></html>
请注意，使用lxml时，元素(标签)只能位于树中的一个位置(因为每个元素都只有一个父级)，因此将tag附加到ol也会将其从footnote中删除.因此，与BeautifulSoup不同，您不需要以相反的顺序遍历内容，也不需要使用insert(0,...).您只需按顺序追加即可.
Note that with lxml, an Element (tag) can be in only one place in the tree (since every Element has only one parent), so appending tag to ol also removes it from footnote. So unlike with BeautifulSoup, you do not need to iterate over the contents in reverse order, nor use insert(0,...). You just append in order.
使用BeautifulSoup:
Using BeautifulSoup:
import bs4 as bs
with open('data', 'r') as f:
soup = bs.BeautifulSoup(f)
footnote = soup.find("div", { "class" : "footnotes" })
new_ol = soup.new_tag("ol")
for content in reversed(footnote.contents):
new_ol.insert(0, content.extract())
footnote.append(new_ol)
print(soup)
打印
<html><body><div class="footnotes"><ol>
<p>Footnote 1</p>
<p>Footnote 2</p>
</ol></div></body></html>
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