使用python/elementree

Question

我需要寻找指定，但不使用命名空间XML解析XML：

<WRMHEADER xmlns="http://schemas.microsoft.com/DRM/2007/03/PlayReadyHeader" version="4.0.0.0"> 
    <DATA> 
     <PROTECTINFO> 
      <KEYLEN>16</KEYLEN> 
      <ALGID>AESCTR</ALGID> 
     </PROTECTINFO> 

     <LA_URL>http://192.168.8.33/license/rightsmanager.asmx</LA_URL> 
     <LUI_URL>http://192.168.8.33/license/rightsmanager.asmx</LUI_URL> 

     <DS_ID></DS_ID> 
     <KID></KID> 
     <CHECKSUM></CHECKSUM> 

    </DATA> 
</WRMHEADER> 

我想阅读的各个领域，例如值数据/ protectinfo/KEYLEN等

root = ET.fromstring(sMyXml) 
keylen = root.findall('./DATA/PROTECTINFO/KEYLEN') 

print root 
print keylen 

此代码打印如下：

<Element {http://schemas.microsoft.com/DRM/2007/03/PlayReadyHeader}WRMHEADER at 0x7f2a7c35be60> 
[] 

root.find和root.findall返回None或[]对于这个查询。我一直无法指定默认名称空间，是否有解决方案来查询这些值？ 感谢

Answer 1

创建一个命名空间字典：

x = """<WRMHEADER xmlns="http://schemas.microsoft.com/DRM/2007/03/PlayReadyHeader" version="4.0.0.0"> 
    <DATA> 
     <PROTECTINFO> 
      <KEYLEN>16</KEYLEN> 
      <ALGID>AESCTR</ALGID> 
     </PROTECTINFO> 

     <LA_URL>http://192.168.8.33/license/rightsmanager.asmx</LA_URL> 
     <LUI_URL>http://192.168.8.33/license/rightsmanager.asmx</LUI_URL> 

     <DS_ID></DS_ID> 
     <KID></KID> 
     <CHECKSUM></CHECKSUM> 

    </DATA> 
</WRMHEADER>""" 
from xml.etree import ElementTree as ET 

root = ET.fromstring(x) 
ns = {"wrm":"http://schemas.microsoft.com/DRM/2007/03/PlayReadyHeader"} 
keylen = root.findall('wrm:DATA', ns) 

print root 
print keylen 

现在你应该得到的东西，如：

<Element '{http://schemas.microsoft.com/DRM/2007/03/PlayReadyHeader}WRMHEADER' at 0x7fd0a30d45d0> 
[<Element '{http://schemas.microsoft.com/DRM/2007/03/PlayReadyHeader}DATA' at 0x7fd0a30d4610>] 

要获得/DATA/PROTECTINFO/KEYLEN：

In [17]: root = ET.fromstring(x) 

In [18]: ns = {"wrm":"http://schemas.microsoft.com/DRM/2007/03/PlayReadyHeader"} 
In [19]: root.find('wrm:DATA/wrm:PROTECTINFO/wrm:KEYLEN', ns).text 
Out[19]: '16' 

Answer 2

我想知道，如果这能也工作。请发表您对这种方法的优缺点的评论。

from xml.dom.minidom import parse 
import xml.dom.minidom 

# Open XML document using minidom parser 
DOMTree = xml.dom.minidom.parse("xmlquestion.xml") 
tn = DOMTree.documentElement 
print tn.namespaceURI 
#print tn.childNodes 

data = tn.getElementsByTagName('DATA')[0] 
protectinfo = data.getElementsByTagName('PROTECTINFO')[0] 
keylen = protectinfo.getElementsByTagName('KEYLEN')[0] 
print keylen.childNodes[0].data 

http://schemas.microsoft.com/DRM/2007/03/PlayReadyHeader 
16