[英]Modify xml file with python script
如何修改以下 xml 片段
<routes xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="http://sumo.dlr.de/xsd/routes_file.xsd">
<vType id="car1_73" length="4.70" minGap="1.00" maxSpeed="12.76" probability="0.00" vClass="passenger" guiShape="passenger/van">
<carFollowing-Krauss accel="2.40" decel="4.00" sigma="0.55"/>
</vType>
<vehicle id="0" type="vTypeDist" depart="0.00" departLane="best" departPos="random" departSpeed="random">
<routeDistribution last="1">
<route cost="108.41" probability="0.44076116" edges="bottom7to7/0 7/0to6/0 6/0to6/1 6/1to5/1 5/1to5/2 5/2to6/2"/>
<route cost="76.56" probability="0.55923884" edges="bottom7to7/0 7/0to6/0 6/0to5/0 5/0to5/1 5/1to5/2 5/2to6/2"/>
</routeDistribution>
</vehicle>
</routes>
使結果看起來像這樣:
<routes xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="http://sumo.dlr.de/xsd/routes_file.xsd">
<vehicle id="0" type="vTypeDist" depart="0.00" departLane="best" departPos="random" departSpeed="random">
<route edges="bottom7to7/0 7/0to6/0 6/0to5/0 5/0to5/1 5/1to5/2 5/2to6/2"/>
</vehicle>
</routes>
基本上必須完成以下工作
<vtype>
(以及其中的<carFollowing...>
元素),<routeDistribution...>
,<route>
元素,它只保留<routeDistribution...>
元素中的最后一個edges
屬性。 編輯:在這里我使用xml.etree.ElementTree
提供我的版本。 為什么所有的downvotes雖然......:/
import xml.etree.ElementTree as ET
if __name__ == "__main__":
tree = ET.parse('total-test.xml')
root = tree.getroot()
# remove <carFollowing> subelement from each vType
vTypes = root.findall("vType")
for vType in vTypes:
carFollowings = vType.findall("carFollowing-Krauss")
for carFollowing in carFollowings:
vType.remove(carFollowing)
# remove each <vType> (to remove an element reference to its parent is required)
for element in root:
if element.tag == "vType":
root.remove(element)
# from root get into <vehicle>
vehicles = root.findall("vehicle")
for vehicle in vehicles:
# for each <vehicle> get reference <routeDistribution>s
routeDistributions = vehicle.findall("routeDistribution")
for routeDist in routeDistributions:
# for each vehicle distrbution get reference to <route>s
routes = routeDist.findall("route")
# fill a container with dictionaries which represent <route> attributes
listOfRouteDicts = list()
for route in routes:
listOfRouteDicts.append(route.attrib)
# find the min_cost for the given routes
min_cost = min(float(routeDict['cost']) for routeDict in listOfRouteDicts)
print(min_cost)
for route in routes:
if route.get('cost') == str(min_cost):
# remove the other attributes of the <route>, we only want the <edges>
route.attrib = {routeAttr:v for routeAttr,v in route.attrib.items() if routeAttr == "edges"}
vehicle.append(route) # move route one level-up to <vehicle> because <routeDistribution> needs to be removed
else:
routeDist.remove(route) # remove all routes which don't have the lowest cost
# remove the <routeDistribution> for each <vehicle>
vehicle.remove(routeDist)
vehicle.set('type', 'vTypeDist')
tree.write('output.xml')
可能你需要一些更通用的東西。 以下腳本接受您的輸入 (in.xml) 並生成新的輸出 (out.xml)。 當然,這不是很好的編碼,但它可以讓您開始使用語法並幫助您根據需要進行概括。
from xml.dom.minidom import parse, parseString
dom = parse("in.xml" ) # parse an XML file
docRoot = dom.documentElement
# delete all vType
vTypeNode = docRoot.getElementsByTagName('vType')[0]
docRoot.removeChild(vTypeNode)
#i keep only first route node... second is the same...
#but i am not sure if this will always be the case
routeNode = docRoot.getElementsByTagName('route')[0]
#remove all old route nodes
vehicleNode = docRoot.getElementsByTagName('vehicle')[0]
for child in vehicleNode.childNodes:
if child.nodeType == child.ELEMENT_NODE:
vehicleNode.removeChild(child)
#create a new route node
newRouteNode = dom.createElement("route")
newRouteNode.setAttribute("edges" , routeNode.getAttribute("edges"))
#append new node
vehicleNode.appendChild(newRouteNode)
#print output
#print dom.toprettyxml()
#write to file
outFile = open("out.xml","wb")
dom.writexml(outFile)
outFile.close()
注意:這只是讓您快速入門!
編輯:
minidom ouptus 總是很臟,因為它包含許多無用的空白。 這是一個眾所周知的問題,但可以通過不同的方式輕松解決。 你可能有興趣看看這里:
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