使用Python解析xml.etree :空结果

Question

我正在尝试用xml.etree解析下面的xml文件。但是，它不会产生任何结果。

from xml.etree import cElementTree as ET
xmlstr = """<?xml version='1.0' encoding='UTF-8'?>

<tns:getCamerasResponse xmlns:tns="https://infoconnect.highwayinfo.govt.nz/schemas/camera2">

    <tns:camera>

        <tns:description>North along Sth Wstn Mwy from May Rd</tns:description>

        <tns:direction>Northbound</tns:direction>

        <tns:group>NA</tns:group>

        <tns:id>653</tns:id>

        <tns:imageUrl>http://www.trafficnz.info/camera/653.jpg</tns:imageUrl>

        <tns:lat>-36.90943</tns:lat>

        <tns:lon>174.73442</tns:lon>

        <tns:name>SH20 May Rd Overbridge</tns:name>

        <tns:offline>false</tns:offline>

        <tns:region>Auckland</tns:region>

        <tns:thumbUrl>http://www.trafficnz.info/camera/thumb/653.jpg</tns:thumbUrl>

        <tns:underMaintenance>false</tns:underMaintenance>

        <tns:viewUrl>http://www.trafficnz.info/camera/view/653</tns:viewUrl>

 </tns:camera>
 </tns:getCamerasResponse>"""



root = ET.fromstring(xmlstr)


results = root.findall('tns:camera', {'tns':"https://infoconnect.highwayinfo.govt.nz/schemas/camera2"})
for camera in results:
    region = camera.find('tns:region')
    if region is not None:
        print(region.text)

Answer 1

您需要在find方法中考虑到命名空间。

from xml.etree import cElementTree as ET
xmlstr = """<?xml version='1.0' encoding='UTF-8'?>

<tns:getCamerasResponse xmlns:tns="https://infoconnect.highwayinfo.govt.nz/schemas/camera2">

    <tns:camera>

        <tns:description>North along Sth Wstn Mwy from May Rd</tns:description>

        <tns:direction>Northbound</tns:direction>

        <tns:group>NA</tns:group>

        <tns:id>653</tns:id>

        <tns:imageUrl>http://www.trafficnz.info/camera/653.jpg</tns:imageUrl>

        <tns:lat>-36.90943</tns:lat>

        <tns:lon>174.73442</tns:lon>

        <tns:name>SH20 May Rd Overbridge</tns:name>

        <tns:offline>false</tns:offline>

        <tns:region>Auckland</tns:region>

        <tns:thumbUrl>http://www.trafficnz.info/camera/thumb/653.jpg</tns:thumbUrl>

        <tns:underMaintenance>false</tns:underMaintenance>

        <tns:viewUrl>http://www.trafficnz.info/camera/view/653</tns:viewUrl>

 </tns:camera>
 </tns:getCamerasResponse>"""



root = ET.fromstring(xmlstr)

ns = {'tns':"https://infoconnect.highwayinfo.govt.nz/schemas/camera2"}
results = root.findall('tns:camera', ns)
for camera in results:
    region = camera.find('tns:region', ns)
    if region is not None:
        print(region.text)

如果您需要知道如何获取名称空间，这可能会对您有所帮助，比如Python: ElementTree, get the namespace string of an Element