Re: insert_after on nested paragraphs
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Aaron DeVore
Mar 9, 2013, 5:30:04 AM3/9/13
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I think your problems is with p.descendants. Tag.descendants is a generator that lazily yields descendant tags/strings. That makes it sensitive to changes in the tree because a tree change can invalidate the current generator state.
Instead, replace "for desc in p.descendants" with "for desc in p.find_all('p')". That builds a list prior to traversing the tree. It also handles the checking for Tag and desc.name == "p".
-Aaron DeVore
Instead, replace "for desc in p.descendants" with "for desc in p.find_all('p')". That builds a list prior to traversing the tree. It also handles the checking for Tag and desc.name == "p".
-Aaron DeVore
On Fri, Mar 8, 2013 at 2:57 AM, TNPetr7 <tnp...@gmail.com> wrote:
Hello everyone,
I'm trying to move nested <p> inside another <p> after the descendants' parent. I'm using BS4 and Python 2.7.3 on Gentoo. Here's the code:
for p in soup.find_all("p"):
for desc in p.descendants:
if isinstance(desc, Tag):
if desc.name == "p":
p.insert_after(desc)
My input may look like this one:
<html>
<head>
<title>title</title>
</head>
<body>
<p>
<p>first nested paragraph</p>
<p><img src="img.png"></p>
<p><br></p>
Text inside parent paragraph.
</p>
</body>
</html>
However, when p.insert_after(desc) is called, the loop processes only the first nested paragraph. My guess is that the loop is trying to continue on the descendants/siblings of the first nested paragraph. Since it's moved, the cycle is broken. I tested desc.extract() and it stops with AttributeError: 'NoneType' object has no attribute 'next_element' after calling it.
Can anyone comment on this and shed some light on how the loop over descendants work? I'm open to any alternative.
Thanks!
P.
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