Python如何实现lxml读取、更新、写入标签值操作

<?xml version="1.0" encoding="UTF-8"?>
<urlset>
<url>
<lastmod>2014-08-26</lastmod>
<changefreq>always</changefreq>
<priority>1.0</priority>
<data>
<display>
<name>zhongguo</name>
<address>zhongguo</address>
<search>http://www.sohu.com</search>
</display>
</data>
</url>
<url>
<lastmod>2014-08-26</lastmod>
<changefreq>always</changefreq>
<priority>1.0</priority>
<data>
<display>
<name>中国</name>
<address>中国</address>
<search>http://www.abc.com</search>
</display>
</data>
</url>
</urlset>

我现在的需求是想将

中的网址改成另一个网址并写入，比如将第一条url结果的”http://www.sohu.com“改成“http://www.sina.com”并写入xml文件中。请问该如何操作？

lxml里面Element对象有个find的方法，先找到对应的path，然后修改就好了
# -*- coding: utf-8 -*- from lxml import etree xml_string = u""" <?xml version="1.0" encoding="UTF-8"?> <urlset> <url> <lastmod>2014-08-26</lastmod> <changefreq>always</changefreq> <priority>1.0</priority> <data> <display> <name>zhongguo</name> <address>zhongguo</address> <search>http://www.sohu.com</search> </display> </data> </url> <url> <lastmod>2014-08-26</lastmod> <changefreq>always</changefreq> <priority>1.0</priority> <data> <display> <name>中国</name> <address>中国</address> <search>http://www.abc.com</search> </display> </data> </url> </urlset> """ root = etree.fromstring(xml_string) for url in root: url_tag = url.find("data/display/search") if url_tag.text == "http://www.sohu.com": url_tag.text = "http://www.sina.com" print etree.tostring(root)

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