CODEWITHSUNDEEP
pythonlxml
user6039980
user6039980

Reputation: 3506

lxml: Element is not a child of this node

I'm trying to change the value of title within the following html document:

<html lang="en">
<head>
  <meta charset="utf-8">
  <title id="title"></title>
  <base href="/">
  <meta name="viewport" content="width=device-width, initial-scale=1">
</head>
<body>
  <app-root></app-root>
</body>
</html>

I wrote the following python script which uses lxml, in order to accomplish the task:

from lxml.html import fromstring, tostring
from lxml.html import builder as E

html = fromstring(open('./index.html').read())
html.replace(html.get_element_by_id('title'), E.TITLE('TEST'))

But after running the script, I get the following error:

ValueError: Element is not a child of this node.

What's supposed to cause this error? Thank you.

Upvotes: 4

Views: 2704

Answers (1)

t.m.adam
t.m.adam

Reputation: 15376

The 'title' tag is a child of the 'head' node. In your code you use replace on the 'html' node, which has no 'title' elements (not directly), hence the ValueError.

You can get the desired results if you use replace on the 'head' node. 

html.find('head').replace(html.get_element_by_id('title'), E.TITLE('TEST'))

Upvotes: 5

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