合并多个< br/>使用python lxml将标签标记为单个 [英] Merge multiple <br /> tags to a single one with python lxml
问题描述
我有一个python脚本来清理抓取的html内容，它使用BeautifulSoup4并运行良好.最近，我决定学习lxml，但是我发现这些教程(对我而言)更难理解.例如，我使用以下代码将多个<br />标记合并为一个，即，如果有多个<br />标记，则删除所有内容，只保留其中一个:
I've a python script to clean scraped html content, it uses BeautifulSoup4 and works pretty well. Recently I have decided to learn lxml but I found the tutorials are harder (for me) to follow. For example I use the following code to merge multiple <br /> tags into one, i.e, if there are more than one <br /> tags, remove all but keep just one:
from bs4 import BeautifulSoup, Tag
data = 'foo<br /><br>bar. <p>foo<br/><br id="1"><br/>bar'
soup = BeautifulSoup(data)
for br in soup.find_all("br"):
while isinstance(br.next_sibling, Tag) and br.next_sibling.name == 'br':
br.next_sibling.extract()
print soup
<html><body><p>foo<br/>bar. </p><p>foo<br/>bar</p></body></html>
我如何在lxml中实现这一点?谢谢，
How do I achieve this similar in lxml? Thanks,
推荐答案
您可以尝试.drop_tag()方法来删除重复出现的<br/>标签的重复出现:
You could try .drop_tag() method to remove duplicate consecutive occurences of <br/> tag:
from lxml import html
doc = html.fromstring(data)
for br in doc.findall('.//br'):
if br.tail is None: # no text immediately after <br> tag
for dup in br.itersiblings():
if dup.tag != 'br': # don't merge if there is another tag inbetween
break
dup.drop_tag()
if dup.tail is not None: # don't merge if there is a text inbetween
break
print(html.tostring(doc))
# -> <div><p>foo<br>bar. </p><p>foo<br>bar</p></div>
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