python对xpath的支持
介绍python的Xpath的python开元项目:1.libxml2-python-2.6.4.tar.gz
安装：下载对应python版本的软件包à解压àpython setup.py install
例一：
import libxml2
def text() :
doc = libxml2.parseFile('/tmp/books.xml')
for book in doc.xpathEval('/bookstore/book') :
print book.content
doc.freeDoc()
例二
import libxml2
doc = libxml2.parseFile('/tmp/books.xml')
doc.xpathEval('/bookstore/book/price + /bookstore/book/price ')
doc.xpathEval('/bookstore/book/price < 0')
doc.freeDoc()
例三
import libxml2
doc = libxml2.parseFile('/tmp/books.xml')
doc.xpathEval('child::book') #返回的结果是什么？为什么
doc.xpathEval('child::bookstore')
doc.xpathEval('descendant::bookstore')
doc.freeDoc()
例四：
import libxml2
doc = libxml2.parseFile('/tmp/books.xml')
doc.xpathEval('/bookstore/book').content
doc.xpathEval('/bookstore/book')
doc.freeDoc()
2.Google的开源项目，python官方网站上推荐的xpath项目，版本为0.1
http://py-dom-xpath.googlecode.com/files/py-dom-xpath-0.1.tar.gz
安装：下载软件包à解压àpython setup.py install
例一
import xpath
import xml.dom.minidom
xml = xml.dom.minidom.parse('/tmp/books.xml')
doc = xml.documentElement
xpath.find('/bookstore/book', doc).toxml()
xpath.find('/bookstore', doc)
例二
import xpath
import xml.dom.minidom
xml = xml.dom.minidom.parse('/tmp/books.xml')
doc = xml.documentElement
context = xpath.XPathContext()
context.variables['max'] = 100
context.variables['min'] = 4
context.findvalues('//book', doc)
还可以根据命名空间查询
详细参考文档：http://py-dom-xpath.googlecode.com/svn/trunk/doc/index.html
3.用python中自带的库解析xml
from xml.etree import ElementTree as XmlTree
xmlDoc = XmlTree.parse('/tmp/books.xml')
xmlRoot = xmlDoc.getroot()
value = xmlRoot.find('book/price').text
print value
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