Elementtree乱序显示元素 [英] Elementtree displaying elements out of order

问题描述

我正在使用Python的ElementTree解析xml文件.我有一个"findall"来查找所有"revision"子元素，但是当我遍历结果时，它们不是按文档顺序排列的.我做错了什么?

这是我的代码:

  allrevisions = page.findall('{http://www.mediawiki.org/xml/export-0.5/} revision')对于所有版本的修订:打印版本打印rev.find('{http://www.mediawiki.org/xml/export-0.5/} timestamp').text 

以下是我正在解析的文档的链接: http://pastie.org/2780983

谢谢，bsg

-糟糕.通过遍历我的代码并逐个运行它，我解决了问题-我在元素列表中的反向()位置卡在了错误的位置，这引起了所有麻烦.非常感谢您的帮助-很抱歉这是一个愚蠢的问题.

解决方案

结果:

1个2个34

查看正在解析的文档会很有帮助.

---

更新:

使用您提供的源数据:

来自__future__的

 导入with_statement将xml.etree.ElementTree导入为使用open('xmldata.xml'，'r')作为f:xmldata = f.read()树= et.fromstring(xmldata)在tree.findall中进行修订('.//{http://www.mediawiki.org/xml/export-0.5/}修订'):打印修订版.find('{http://www.mediawiki.org/xml/export-0.5/} text').text [0:10] .encode('utf8') 

结果:

‘思想{{db-spam}‘思想敏< ;!-恳求

与文档中显示的顺序相同.

I'm using Python's ElementTree to parse xml files. I have a "findall" to find all "revision" subelements, but when I iterate through the result, they are not in document order. What can I be doing wrong?

Here's my code:

allrevisions = page.findall('{http://www.mediawiki.org/xml/export-0.5/}revision')
for rev in allrevisions:
    print rev
    print rev.find('{http://www.mediawiki.org/xml/export-0.5/}timestamp').text

Here's a link to the document I'm parsing: http://pastie.org/2780983

Thanks, bsg

-Oops. By going through my code and running it piece by piece, I worked out the problem - I had stuck in a reverse() on the elements list in the wrong place, which was causing all the trouble. Thank you so much for your help - I'm sorry it was such a silly issue.

解决方案

The documentation for ElementTree says that findall returns the elements in document order.

A quick test shows the correct behaviour:

import xml.etree.ElementTree as et

xmltext = """
<root>
    <number>1</number>
    <number>2</number>
    <number>3</number>
    <number>4</number>
</root>
"""

tree = et.fromstring(xmltext)

for number in tree.findall('number'):
    print number.text

Result:

1
2
3
4

It would be helpful to see the document you are parsing.

---

Update:

Using the source data you provided:

from __future__ import with_statement
import xml.etree.ElementTree as et

with open('xmldata.xml', 'r') as f:
    xmldata = f.read()

tree = et.fromstring(xmldata)

for revision in tree.findall('.//{http://www.mediawiki.org/xml/export-0.5/}revision'):
    print revision.find('{http://www.mediawiki.org/xml/export-0.5/}text').text[0:10].encode('utf8')

Result:

‘The Mind 
{{db-spam}
‘The Mind 
'''The Min
<!-- Pleas

The same order as they appear in the document.

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