介紹python的Xpath的python開元項目:
安裝:下載對應python版本的軟件包à解壓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[1]/price + /bookstore/book[1]/price ')
doc.xpathEval('/bookstore/book[2]/price < 0')
doc.freeDoc()
例三
import libxml2
doc = libxml2.parseFile('/tmp/books.xml')
doc.xpathEval('child::book') #返回的結果是什麼?爲什麼
doc.xpathEval('child::bookstore')
doc.xpathEval('descendant::bookstore')
doc.freeDoc()
例四:
import libxml2
doc = libxml2.parseFile('/tmp/books.xml')
doc.xpathEval('/bookstore/book[price>35.00]')[0].content
doc.xpathEval('/bookstore/book[last()]')
doc.freeDoc()
2.Google的開源項目,python官方網站上推薦的xpath項目,版本爲0.1
http://py-dom-xpath.googlecode.com/files/py-dom-xpath-0.1.tar.gz
安裝:下載軟件包à解壓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[1]', doc)[0].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[price>=$min and price<=$max]', doc)
還可以根據命名空間查詢
詳細參考文檔:http://py-dom-xpath.googlecode.com/svn/trunk/doc/index.html
3.用python中自帶的庫解析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