python xml文件读写

xml文件生成：

def GenerateXml():
    impl = xml.dom.minidom.getDOMImplementation()
    dom = impl.createDocument(None, 'detect', None)
    root = dom.documentElement
    baseInfo = dom.createElement('baseInfo')
    root.appendChild(baseInfo)

    dateE=dom.createElement('date')
    dateT=dom.createTextNode('2015-01-11 14:23:00')
    dateE.appendChild(dateT)
    baseInfo.appendChild(dateE)

    lineNameE = dom.createElement('lineName')
    lineNameT = dom.createTextNode('京津线')
    lineNameE.appendChild(lineNameT)
    baseInfo.appendChild(lineNameE)

    directionE = dom.createElement('direction')
    directionT = dom.createTextNode('下行')
    directionE.appendChild(directionT)
    baseInfo.appendChild(directionE)

    startStationE = dom.createElement('startStation')
    startStationT = dom.createTextNode('北京')
    startStationE.appendChild(startStationT)
    baseInfo.appendChild(startStationE)

    endStationE = dom.createElement('endStation')
    endStationT = dom.createTextNode('天津')
    endStationE.appendChild(endStationT)
    baseInfo.appendChild(endStationE)

    trainNoE = dom.createElement('trainNo')
    trainNoT = dom.createTextNode('G121')
    trainNoE.appendChild(trainNoT)
    baseInfo.appendChild(trainNoE)

    appendInfo = dom.createElement('appendInfo')
    root.appendChild(appendInfo)

    startTimeE = dom.createElement('startTime')
    startTimeT = dom.createTextNode('2015-01-11 14:23:00')
    startTimeE.appendChild(startTimeT)
    appendInfo.appendChild(startTimeE)

    endTimeE = dom.createElement('endTime')
    endTimeT = dom.createTextNode('2015-01-11 14:23:59')
    endTimeE.appendChild(endTimeT)
    appendInfo.appendChild(endTimeE)

    startKmE = dom.createElement('startKm')
    startKmT = dom.createTextNode('123')
    startKmE.appendChild(startKmT)
    appendInfo.appendChild(startKmE)

    endKmE = dom.createElement('endKm')
    endKmT = dom.createTextNode('234')
    endKmE.appendChild(endKmT)
    appendInfo.appendChild(endKmE)

    startPoleNoE = dom.createElement('startPoleNo')
    startPoleNoT = dom.createTextNode('34')
    startPoleNoE.appendChild(startPoleNoT)
    appendInfo.appendChild(startPoleNoE)

    endPoleNoE = dom.createElement('endPoleNo')
    endPoleNoT = dom.createTextNode('45')
    endPoleNoE.appendChild(endPoleNoT)
    appendInfo.appendChild(endPoleNoE)

    f = open('info2.xml', 'w')
    dom.writexml(f, addindent='  ', newl='\n', encoding='utf-8')
    f.close()


if __name__ == '__main__':
    GenerateXml()

XML文件读：

from xml.dom import minidom


def get_attrvalue(node, attrname):
    return node.getAttribute(attrname) if node else ''


def get_nodevalue(node, index=0):
    return node.childNodes[index].nodeValue if node else ''


def get_xmlnode(node, name):
    return node.getElementsByTagName(name) if node else []


def xml_to_string(filename='user.xml'):
    doc = minidom.parse(filename)
    return doc.toxml('UTF-8')


def get_xml_data(filename='info.xml'):
    doc = minidom.parse(filename)
    root = doc.documentElement

    baseInfo_nodes = get_xmlnode(root, 'baseInfo')
    appendInfo_nodes = get_xmlnode(root, 'appendInfo')
    info_list = []

    for node in baseInfo_nodes:
        node_date = get_xmlnode(node, 'date')
        node_lineName = get_xmlnode(node, 'lineName')
        node_direction = get_xmlnode(node, 'direction')
        node_startStation = get_xmlnode(node, 'startStation')
        node_endStation = get_xmlnode(node, 'endStation')
        node_trainNo = get_xmlnode(node, 'trainNo')


        baseInfo_date = get_nodevalue(node_date[0]).encode('utf-8', 'ignore')
        baseInfo_lineName = get_nodevalue(node_lineName[0]).encode('utf-8', 'ignore')
        baseInfo_direction = get_nodevalue(node_direction[0]).encode('utf-8', 'ignore')
        baseInfo_startStation = get_nodevalue(node_startStation[0]).encode('utf-8', 'ignore')
        baseInfo_endStation = get_nodevalue(node_endStation[0]).encode('utf-8', 'ignore')
        baseInfo_trainNo = get_nodevalue(node_trainNo[0]).encode('utf-8', 'ignore')

        baseInfo = {}
        baseInfo['date'] = baseInfo_date
        baseInfo['lineName'] = baseInfo_lineName
        baseInfo['direction'] = baseInfo_direction
        baseInfo['startStation'] = baseInfo_startStation
        baseInfo['endStation'] = baseInfo_endStation
        baseInfo['trainNo'] = baseInfo_trainNo
        info_list.append(baseInfo)

    for node in appendInfo_nodes:
        node_startTime = get_xmlnode(node, 'startTime')
        node_endTime = get_xmlnode(node, 'endTime')
        node_startKm = get_xmlnode(node, 'startKm')
        node_endKm = get_xmlnode(node, 'endKm')
        node_startPoleNo = get_xmlnode(node, 'startPoleNo')
        node_endPoleNo = get_xmlnode(node, 'endPoleNo')

        appendInfo_startTime = get_nodevalue(node_startTime[0]).encode('utf-8', 'ignore')
        appendInfo_endTime = get_nodevalue(node_endTime[0]).encode('utf-8', 'ignore')
        appendInfo_startKm = get_nodevalue(node_startKm[0]).encode('utf-8', 'ignore')
        appendInfo_endKm = get_nodevalue(node_endKm[0]).encode('utf-8', 'ignore')
        appendInfo_startPoleNo = get_nodevalue(node_startPoleNo[0]).encode('utf-8', 'ignore')
        appendInfo_endPoleNo = get_nodevalue(node_endPoleNo[0]).encode('utf-8', 'ignore')

        appendInfo = {}
        appendInfo['startTime'] = appendInfo_startTime
        appendInfo['endTime'] = appendInfo_endTime
        appendInfo['startKm'] = appendInfo_startKm
        appendInfo['endKm'] = appendInfo_endKm
        appendInfo['startPoleNo'] = appendInfo_startPoleNo
        appendInfo['endPoleNo'] = appendInfo_endPoleNo
        info_list.append(appendInfo)

    return info_list


def test_laod_xml(fileName):
    info_list = get_xml_data(fileName)
    i = 0
    for info in info_list:
        if i == 0:
            print '-----------------------------------------------------'
            if info:
                info_str = '检测日期：%s\n线路：%s\n行别：%s\n起始站：%s\n结束站：%s\n机车号：%s\n ' % (
                    info['date'], info['lineName'], info['direction'], info['startStation'], info['endStation'], info['trainNo'])
            print info_str
            print '====================================================='
            i += 1
        else:
            print '-----------------------------------------------------'
            if info:
                info_str = '开始录制时间：%s\n结束录制时间：%s\n开始公里标：%s\n结束公里标：%s\n开始杆号：%s\n结束杆号：%s\n ' % (
                    info['startTime'], info['endTime'], info['startKm'], info['endKm'], info['startPoleNo'],
                    info['endPoleNo'])
            print info_str
            print '====================================================='




if __name__ == "__main__":
    test_laod_xml('info.xml')

参考博客：
http://blog.sina.com.cn/s/blog_63041bb80101bs5r.html