如何在lxml.html树中插入HTML元素
[英]How to insert a HTML element in a tree of lxml.html
问题描述
I am using python 3.3 and lxml 3.2.0 
我使用的是python 3.3和lxml 3.2.0
Problem: I have a web page in a variable webpageString = "<html><head></head><body>webpage content</body></html>" And I want to insert a css link tag between the two header tags, so that I get webpageString = "<html><head><link rel='stylesheet' type='text/css'></head><body>webpage content</body></html>" 问题：我在变量webpageString = "<html><head></head><body>webpage content</body></html>"有一个webpageString = "<html><head></head><body>webpage content</body></html>" ，我想在两个标题之间插入一个css链接标记标签，以便我得到webpageString = "<html><head><link rel='stylesheet' type='text/css'></head><body>webpage content</body></html>"
I have written the following code: 我写了以下代码：
def addCssCode(self):
tree = html.fromstring(self.article)
headTag = tree.xpath("//head")
#htmlTag = tree.getroot()
if headTag is None:
pass #insert the head tag first
cssLinkString = "<link rel='stylesheet' type='text/css' href='"+ self.cssLocation+"'>"
headTag[0].insert(1, html.HtmlElement(cssLinkString))
print(cssLinkString)
self.article = html.tostring(tree).decode("utf-8")
Which results in insertion of- 导致插入 -
<HtmlElement>< link rel='stylesheet' type='text/css' href='cssCode.css' ></HtmlElement>
I also tried solution in the following page to an identical problem, but it also didn't work. 我也尝试在下一页解决相同的问题，但它也没有用。 python lxml append element after another element python lxml追加另一个元素之后的元素
How can I solve this? 我怎么解决这个问题？ Thanks 谢谢
1 个解决方案
解决方案1
1 已采纳 2013-06-21 13:05:09
Use .insert / .append method. 使用.insert / .append方法。
import lxml.html
def add_css_code(webpageString, linkString):
root = lxml.html.fromstring(webpageString)
link = lxml.html.fromstring(linkString).find('.//link')
head = root.find('.//head')
title = head.find('title')
if title == None:
where = 0
else:
where = head.index(title) + 1
head.insert(where, link)
return lxml.html.tostring(root)
webpageString1 = "<html><head><title>test</title></head><body>webpage content</body></html>"
webpageString2 = "<html><head></head><body>webpage content</body></html>"
linkString = "<link rel='stylesheet' type='text/css'>"
print(add_css_code(webpageString1, linkString))
print(add_css_code(webpageString2, linkString))
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