python 解析xml文档

今天用到python解析xml文档，再改变数据之后，再保存会文件。

记录下代码：

import os,sys
from xml.dom.minidom import parse,Text
class DIYDom():
def __init__(self,path):
        self.path = path
        self.dom = self.toDOM(path)

def toDOM(self,path):
if os.path.isfile(path):
return parse(path)
return False

def getNode(self,uri,createFlag = False):
if uri[0] == "/":
            uri = uri[1:]
if uri[-1] == "/":
            uri = uri[:-1]
        path = uri.split("/")
        node = self.dom
        existFlag = False
for p in path:
for n in node.childNodes:
if n.nodeName == p:
                    node = n 
                    existFlag = True
break
if existFlag == False and createFlag == True:
                node = self.createNode(node,p)
if existFlag == False and createFlag == False:
return False
            existFlag = False
return node

def createNode(self,parentNode,nodeName):
return parentNode.appendChild(self.dom.createElement(nodeName))

def setText(self,uri,text,createFlag = False):
        node = self.getNode(uri,createFlag)    
if node == False:
return False
        t = Text()
        t.data = text
if node.firstChild == None:
            node.appendChild(t)
else:
            node.replaceChild(t,node.firstChild)
return True

def toXML(self):
        domString = self.dom.toxml()
return domString

def saveXML(self):
        xmlString = self.toXML()
        xmlFile = open(self.path,"w")
try:
            xmlFile.write(xmlString)
return True
finally:
            xmlFile.close()


D = DIYDom("XML_NAME.zone.xml")
##node = D.getNode("/zone/extension/file")
D.setText("/zone/extension/files","testFile",True)
D.setText("/zone/extension/file","testFile",True)
D.setText("/zone/extension/propertiesFile","testFile",True)
print D.toXML()

XML_NAME.zone.xml的内容为：

<name>name</name>
<extension>
<name>testName</name>
<file>testFile</file>
<propertiesFile>testProperties</propertiesFile>
</extension>

print D.toXML()