Python XML Parsing Children 和 Grand children 属性

Question

在过去的两周里，我一直在尝试打开和关闭它，并查看 python 的文档以进行 XML 解析。我仍然可以弄清楚它是否是 Xpath 的东西。如果有人能提供一些帮助，我将不胜感激。

我的 XML 文件有很多子文件，我正在使用 root.findall() 来获取 myAccessPoints 的属性，然后在它下面的三个子文件中我有一个元素，其中包含我想要提取的多个属性。但是，到目前为止，我只能使用 2 个 for 循环来做到这一点。

import xml.etree.ElementTree as ET



def apData():

    tree = ET.parse("project.xml")

    root = tree.getroot()
    for topLevels in root.findall("./myAccessPoints//*[@id]"):
        myApId = topLevels.get('id')
        print("AP:%s" % myApId)
        print()
        #return myApId

    for radio in root.findall("./accessPoints/accessPoint/radio/*"):
        rChannel = radio.get('primaryNumber')
        rMac = radio.get('mac')
        rSsid = radio.get('primaryNumber')
        print(rChannel, rMac, rSsid)
        #return rChannel, rMac, rSsid

以下是 XML 文件的示例：

<?xml version="1.0" encoding="UTF-8"?>
<project>
  <maps>
    <map id="0" name="floorplan" pixelsPerMeter="47.808212118953044" type="fspl"/>
  </maps>
  <accessPoints>
    <accessPoint id="0" userDefinedPosition="false">
      <radio type="measured">
        <accessPointMeasurement mac="a0:63:91:21:c4:f8" ssid="Eggs" primaryNumber="7" primaryFrequencyMhz="2442" centerNumber="7" bandwidthMhz="20" security="WPA2" informationElements="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">
          <technologies>
            <technology band="802.11g"/>
            <technology band="802.11b"/>
            <technology band="802.11n"/>
          </technologies>
        </accessPointMeasurement>
      </radio>
    </accessPoint>
    <accessPoint id="1" userDefinedPosition="false">

最终我会像这样使用接入点元素属性 -->

接入点标识

accessPointMeasurement mac、ssid、primaryNumber

技术乐队

技术乐队

技术乐队

一些 accessPoint 元素有 2 组无线电，所以我必须获得两次 accessPointMeasurement 属性。

我想我必须创建一个类，并且在该类中我必须在自己内部制作列表或字典。

除了了解如何在一个 for 循环中获取每个接入点及其属性（如果可能的话）之外，我并没有要求任何人为我做任何事情。

感谢您的帮助。

Answer 1

我扩展了您的 XML 以包含更多 accessPoints 和 radios 并使用 lxml 库来访问其 xpath 功能。嵌套循环。

from lxml import etree

tree = etree.parse('temp.xml')
accessPoints = tree.xpath('.//accessPoint')

for accessPoint in accessPoints:
    print ('accessPoint id:', accessPoint.attrib['id'])
    radios = accessPoint.xpath('radio')
    for radio in radios:
        accessPointMeasurement = radio.xpath('accessPointMeasurement')
        print ('\taccessPointMeasurement: ', accessPointMeasurement[0].attrib)
        technologies = radio.xpath('.//technology')
        for technology in technologies:
            print ('\t\ttechnology: ', technology.attrib)

结果如下：

accessPoint id: 0
    accessPointMeasurement:  {'security': 'WPA2', 'informationElements': '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', 'bandwidthMhz': '20', 'centerNumber': '7', 'mac': 'a0:63:91:21:c4:f8', 'ssid': 'Eggs', 'primaryFrequencyMhz': '2442', 'primaryNumber': '7'}
        technology:  {'band': '802.11g'}
        technology:  {'band': '802.11b'}
        technology:  {'band': '802.11n'}
accessPoint id: 2
    accessPointMeasurement:  {'security': 'WPA2', 'informationElements': '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', 'bandwidthMhz': '20', 'centerNumber': '7', 'mac': 'a0:63:91:21:c4:f8', 'ssid': 'Eggs', 'primaryFrequencyMhz': '2442', 'primaryNumber': '7'}
        technology:  {'band': '802.11g'}
        technology:  {'band': '802.11b'}
        technology:  {'band': '802.11n'}
    accessPointMeasurement:  {'security': 'WPA2', 'informationElements': '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', 'bandwidthMhz': '20', 'centerNumber': '7', 'mac': 'a0:63:91:21:c4:f8', 'ssid': 'Eggs', 'primaryFrequencyMhz': '2442', 'primaryNumber': '7'}
        technology:  {'band': '802.11g'}
        technology:  {'band': '802.11b'}
        technology:  {'band': '802.11n'}