python:访问xml的两种方式

def readXML(filename):
    try:
        if re.search('.xml$', filename):
            XML=ET.parse(os.getcwd()+filename) #xml为xml文件
        else:
            XML=ET.fromstring(filename) #xml为字符串
        return XML
    except Exception, e:
        print "readXML", e
        return -1


#xml为xml文件
    config = readXML("./config.xml")
    webInfo=config.find('webInfo')
    Domain=webInfo.find('Domain').text
    profile=webInfo.find('profile').text

#xml为字符串
    html="<authenticationinfo><info><profile>wuling</profile><displayname>wuling</displayname><peerid>wuling@tonidoid.com</peerid><authenticated>1</authenticated><isremote>1</isremote><reasoncode>0</reasoncode></info></authenticationinfo>"
    root=readXML(html)
    result=root.find("command/result")
    secretqn=root.find("command/message")