我有一个结构如下的xml：
<routes xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="http://sumo.dlr.de/xsd/routes_file.xsd">
<vType id="Bus" vClass="ignoring" guiShape="bus" color="cyan"/>
<vehicle id="1.0" type="Bus" depart="0.00">
<route edges="207358226 206878618#0 206878618#1 206878618#2 206878571 206878624#0 195427225#1 25450515 171767377#0 171767377#1 195427224#0 96336873 96336870"/>
</vehicle>
<vehicle id="2.0" type="Taxi" depart="0.00">
<route edges="172428613 -25301974#1 -25301974#0 172428582 -172428593 -25301969#5 -25301969#4 -165310768#1 -165310768#0 -45073854#4 -45073854#3 -45073854#0 -32932418#2 172436826#1 172436826#2 172436826#3 172436826#4 172436826#5 172405270#0 24629564 172405301#1 -172405301#1 -24629564 -172405270#0"/>
</vehicle>
<vehicle id="1.1" type="Bus" depart="0.00">
<route edges="207358226 206878618#0 206878618#1 206878618#2 206878571 206878624#0 195427225#1 25450515 171767377#0 171767377#1 195427224#0 96336873 96336870"/>
</vehicle>
有多个vType元素（例如公共汽车，出租车，乘用车等），对于每个vType，有vehicle的多个即时对应（编号为1.0,1.1等）将路径边作为属性。
我现在要附加文件，以便我现在在车辆下面有一个子元素stop，指定止损如下
<routes xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="http://sumo.dlr.de/xsd/routes_file.xsd">
<vType id="Bus" vClass="ignoring" guiShape="bus" color="cyan"/>
<vehicle id="1.0" type="Bus" depart="0.00">
<route edges="207358226 206878618#0 206878618#1 206878618#2 206878571 206878624#0 195427225#1 25450515 171767377#0 171767377#1 195427224#0 96336873 96336870"/>
<stop lane="207358226" endPos="10" duration="20"/>
<stop lane="206878618#0" endPos="10" duration="20"/>
<stop lane="206878618#1" endPos="10" duration="20"/>
..........
..........
</vehicle>
<vehicle id="2.0" type="Taxi" depart="0.00">
<route edges="172428613 -25301974#1 -25301974#0 172428582 -172428593 -25301969#5 -25301969#4 -165310768#1 -165310768#0 -45073854#4 -45073854#3 -45073854#0 -32932418#2 172436826#1 172436826#2 172436826#3 172436826#4 172436826#5 172405270#0 24629564 172405301#1 -172405301#1 -24629564 -172405270#0"/>
</vehicle>
<vehicle id="1.1" type="Bus" depart="0.00">
<route edges="207358226 206878618#0 206878618#1 206878618#2 206878571 206878624#0 195427225#1 25450515 171767377#0 171767377#1 195427224#0 96336873 96336870"/>
<stop lane="207358226" endPos="10" duration="20"/>
<stop lane="206878618#0" endPos="10" duration="20"/>
<stop lane="206878618#1" endPos="10" duration="20"/>
..........
..........
</vehicle>
我最初的方法是迭代解析xml并选取带有标记vehicle和属性Bus的元素。然后我将边缘复制到列表edgesnew中。然后，我在一个名为stop的车辆下的循环内迭代地创建一个子元素。代码如下
parser = etree.XMLParser(encoding='utf-8', recover=True)
routesFileTree = etree.parse('kaiserslautern.rou1.xml', parser)
routesFileRoot = routesFileTree.getroot()
vehicle = routesFileRoot.find('vehicle')
route = etree.SubElement(vehicle, 'route')
for elem in routesFileRoot.iter(tag = 'vehicle'):
if elem.attrib['type'] == 'Bus':
for subelem in elem.iter(tag = 'route'):
if subelem.attrib.get('edges'):
edgesnew = subelem.attrib['edges'].split(' ')
for edges in range(0,len(edgesnew),3):
stop = etree.SubElement(vehicle,'stop', lane = stops[edgesnew[edges]], duration = "30")
程序执行但我的算法错误，因为当我尝试打印
时它返回以下输出<routes xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="http://sumo.dlr.de/xsd/routes_file.xsd">
<vType id="Bus" vClass="ignoring" guiShape="bus" color="cyan"/>
<vehicle id="1.0" type="Bus" depart="0.00">
<route edges="207358226 206878618#0 206878618#1 206878618#2 206878571 206878624#0 195427225#1 25450515 171767377#0 171767377#1 195427224#0 96336873 96336870"/>
<route><stop lane="207358226" duration="30" endPos="10"/><stop lane="206878618#0" duration="30" endPos="10"/><.........../></route></vehicle>
<vehicle id="2.0" type="Taxi" depart="0.00">
<route edges="172428613 -25301974#1 -25301974#0 172428582 -172428593 -25301969#5 -25301969#4 -165310768#1 -165310768#0 -45073854#4 -45073854#3 -45073854#0 -32932418#2 172436826#1 172436826#2 172436826#3 172436826#4 172436826#5 172405270#0 24629564 172405301#1 -172405301#1 -24629564 -172405270#0"/>
</vehicle>
<vehicle id="1.1" type="Bus" depart="0.00">
<route edges="207358226 206878618#0 206878618#1 206878618#2 206878571 206878624#0 195427225#1 25450515 171767377#0 171767377#1 195427224#0 96336873 96336870"/>
</vehicle>
代码中存在多个问题。首先，它仅为车辆的一个实例化创建新的子元素。其次，它创建新的route元素，而不是附加到现有的xml。我已经看到我需要使用element.append，但无法弄清楚在哪里和如何。
提前感谢您的帮助