如何使用lxml更新XML文件 [英] How to update XML file with lxml

问题描述

我想通过使用lxml库用新​​信息更新xml文件. 例如，我有以下代码:

I want to update xml file with new information by using lxml library. For example, I have this code:

>>> from lxml import etree
>>>
>>> tree = etree.parse('books.xml')

其中的"books.xml"文件具有以下内容: http://www.w3schools. com/dom/books.xml

where 'books.xml' file, has this content: http://www.w3schools.com/dom/books.xml

我想用新书更新此文件:

I want to update this file with new book:

>>> new_entry = etree.fromstring('''<book category="web" cover="paperback">
... <title lang="en">Learning XML 2</title>
... <author>Erik Ray</author>
... <year>2006</year>
... <price>49.95</price>
... </book>''')

我的问题是，如何用new_entry树更新tree元素树并保存文件.

My question is, how can I update tree element tree with new_entry tree and save the file.

推荐答案

在这里，获取树的根，追加新元素，将树作为字符串保存到文件中

Here you go, get the root of the tree, append your new element, save the tree as a string to a file:

from lxml import etree

tree = etree.parse('books.xml')

new_entry = etree.fromstring('''<book category="web" cover="paperback">
<title lang="en">Learning XML 2</title>
<author>Erik Ray</author>
<year>2006</year>
<price>49.95</price>
</book>''')

root = tree.getroot()

root.append(new_entry)

f = open('books-mod.xml', 'w')
f.write(etree.tostring(root, pretty_print=True))
f.close()

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