XML解析属性使用命名空间

问题描述：

<feed xmlns:im="http://itunes.apple.com/rss" xmlns="http://www.w3.org/2005/Atom" xml:lang="en"> 
<id> 
https://itunes.apple.com/IN/rss/topfreeapplications/limit=200/xml 
</id> 
<title>iTunes Store: Top Free Apps</title> 
<updated>2016-12-05T12:37:06-07:00</updated> 
<link rel="alternate" type="text/html" href="https://itunes.apple.com/WebObjects/MZStore.woa/wa/viewTop?cc=in&amp;id=134581&amp;popId=27"/> 
<link rel="self" href="https://itunes.apple.com/IN/rss/topfreeapplications/limit=200/xml"/> 
<icon>http://itunes.apple.com/favicon.ico</icon> 
<author> 
    <name>iTunes Store</name> 
    <uri>http://www.apple.com/uk/itunes/</uri> 
</author> 
<rights>Copyright 2008 Apple Inc.</rights> 
<entry> 
    <updated>2016-12-05T12:37:06-07:00</updated> 
<id im:id="473941634" im:bundleId="com.one97.paytm">https://itunes.apple.com/in/app/recharge-bill-payment-wallet/id473941634?mt=8&amp;uo=2</id> 
<title>Recharge, Bill Payment &amp; Wallet - Paytm Mobile Solutions</title> 
<summary></summary> 
<im:name>Recharge, Bill Payment &amp; Wallet</im:name> 
<link rel="alternate" type="text/html" href="https://itunes.apple.com/in/app/recharge-bill-payment-wallet/id473941634?mt=8&amp;uo=2"/> 
<im:contentType term="Application" label="Application"/> 
<category im:id="6024" term="Shopping" scheme="https://itunes.apple.com/in/genre/ios-shopping/id6024?mt=8&amp;uo=2" label="Shopping"/> 
<im:artist href="https://itunes.apple.com/in/developer/paytm-mobile-solutions/id473941637?mt=8&amp;uo=2">Paytm Mobile Solutions</im:artist> 
<im:price amount="0.00000" currency="INR">Get</im:price> 
<im:image height="53">http://is1.mzstatic.com/image/thumb/Purple71/v4/9b/37/bf/9b37bf75-6b4d-9c95-a8a4-ea369f05ae7e/pr_source.png/53x53bb-85.png</im:image> 
<im:image height="75">http://is5.mzstatic.com/image/thumb/Purple71/v4/9b/37/bf/9b37bf75-6b4d-9c95-a8a4-ea369f05ae7e/pr_source.png/75x75bb-85.png</im:image> 
<im:image height="100">http://is5.mzstatic.com/image/thumb/Purple71/v4/9b/37/bf/9b37bf75-6b4d-9c95-a8a4-ea369f05ae7e/pr_source.png/100x100bb-85.png</im:image> 
<rights>© One97 Communications Ltd</rights> 
<im:releaseDate label="24 October 2011">2011-10-24T16:18:48-07:00</im:releaseDate> 
<content type="html"></content> 
</entry> 
</feed>

我想提取每个条目值的ID信息：属性如下：“IM：ID”

from xml.dom import minidom 
xmldoc = minidom.parse('topIN.xml') 
itemlist = xmldoc.getElementsByTagName('link') 
print(len(itemlist)) 
print(itemlist[0].attributes.keys())

我得到的信息： [u'href 'u'type'，u'rel']

但是当我做同样的id时，没有任何回报。

答

下面是一个使用版本xml.etree.ElementTree：

import xml.etree.ElementTree as ET 

tree = ET.parse('topIN.xml') 
root = tree.getroot() 
ns={'im':"http://itunes.apple.com/rss", 'atom':"http://www.w3.org/2005/Atom"} 
for id_ in root.findall('atom:entry/atom:id', ns): 
    print (id_.attrib['{' + ns['im'] + '}id'])

下面是一个使用版本lxml：

from lxml import etree 
root=etree.parse('topIN.xml') 
ns={'im':"http://itunes.apple.com/rss", 'atom':"http://www.w3.org/2005/Atom"} 
print('\n'.join(root.xpath('atom:entry/atom:id/@im:id', namespaces=ns)))

答

这工作：

from xml.dom import minidom 
    xmldoc = minidom.parse('topIN.xml') 
    itemlist = xmldoc.getElementsByTagName('entry') 
    print(len(itemlist)) 
    for s in itemlist: 
     print s.getElementsByTagName('id')[0].attributes['im:id'].value

XML解析属性使用命名空间

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