有没有一种方法可以使用 python 通过 elementtree 中的 id 属性过滤 xml

Question

我是 python 的新手，尤其是 elementtree，我正在尝试从 xml 中过滤一些信息。我已经设法找到每个 TX id（坐标）所需的信息，但是我想将其过滤为仅 Tx id "TxA"。我包含了 xml 文件的一部分和下面的代码以及一些注释以帮助显示问题。非常感谢任何帮助或指导。

所有列表都是以前设置的（因此附加）评论部分，对所有 Tx id 都有效，但是我现在回去尝试过滤 Subelm.attrib 给出 Tx id。我在第 5-8 行的代码中展示了我所做的两次尝试

XML的一部分：

<TX id="TxA">
  <Tx_WGS84_Longitude>-105.0846057</Tx_WGS84_Longitude>
  <Tx_WGS84_Latitude>42.9565772</Tx_WGS84_Latitude>
  <Tx_Easting>678133.8818</Tx_Easting>
  <Tx_Northing>895120.939</Tx_Northing>
  <Channel id="3">
    <Ant_Config> =</Ant_Config>
    <Ant_name>Tx_ant_name1</Ant_name>
    <Ant_Electrode_1>TxAEL1<Ant_Easting>678135.1069</Ant_Easting><Ant_Northing>895248.2057</Ant_Northing></Ant_Electrode_1>
    <Ant_Electrode_2>TxAEL2<Ant_Easting>678137.0213</Ant_Easting><Ant_Northing>891059.2502</Ant_Northing></Ant_Electrode_2>
  </Channel>
  <Channel id="1">
    <Ant_Config> =</Ant_Config>
    <Ant_name>Tx_ant_name2</Ant_name>
    <Ant_Electrode_1>TxAEL1<Ant_Easting>678135.1069</Ant_Easting><Ant_Northing>895248.2057</Ant_Northing></Ant_Electrode_1>
    <Ant_Electrode_2>TxAEL2<Ant_Easting>678137.0213</Ant_Easting><Ant_Northing>891059.2502</Ant_Northing></Ant_Electrode_2>
  </Channel>
</TX>
<TX id="TxB">
  <Tx_WGS84_Longitude>-105.08459550832</Tx_WGS84_Longitude>
  <Tx_WGS84_Latitude>42.9506068474998</Tx_WGS84_Latitude>
  <Tx_Easting>678135.4896</Tx_Easting>
  <Tx_Northing>893006.9206</Tx_Northing>
  <Channel id="3">
    <Ant_Config> =</Ant_Config>
    <Ant_name>Tx_ant_name1</Ant_name>
    <Ant_Electrode_1>TxBEL1<Ant_Easting>678135.6131</Ant_Easting><Ant_Northing>893055.2569</Ant_Northing></Ant_Electrode_1>
    <Ant_Electrode_2>TxBEL2<Ant_Easting>678138.3127</Ant_Easting><Ant_Northing>888854.3852</Ant_Northing></Ant_Electrode_2>
  </Channel>
  <Channel id="1">
    <Ant_Config> =</Ant_Config>
    <Ant_name>Tx_ant_name2</Ant_name>
    <Ant_Electrode_1>TxBEL1<Ant_Easting>678135.6131</Ant_Easting><Ant_Northing>893055.2569</Ant_Northing></Ant_Electrode_1>
    <Ant_Electrode_2>TxBEL2<Ant_Easting>678138.3127</Ant_Easting><Ant_Northing>888854.3852</Ant_Northing></Ant_Electrode_2>
  </Channel>

部分Python代码：

for child in root:
if child.tag=='Layout':
    for subelm in child:
        if subelm.tag=='TX':
            for name in subelm.iter('TxA'):
                print (subelm.attrib)
            if ('id' in subelm.attrib.text): 
                print (subelm.attrib.text)
                for channel in subelm:
                    for electrode in channel:
                        for electrode1 in electrode.iter('Ant_Electrode_1'):
                            for electrode1 in electrode.iter('Ant_Easting'):
                                x1t.append(electrode1.text)
                            for electrode1 in electrode.iter('Ant_Northing'):
                                y1t.append(electrode1.text)
                        for electrode2 in electrode.iter('Ant_Electrode_2'):
                            for electrode2 in electrode.iter('Ant_Easting'):
                                x2t.append(electrode2.text)
                            for electrode2 in electrode.iter('Ant_Northing'):
                                y2t.append(electrode2.text)

Answer 1

您可以只使用 xpath 表达式：

>>> from lxml import etree
>>> with open('data.xml') as fd:
...   doc = etree.parse(fd)
...
>>> matches = doc.xpath('//TX[@id="TxA"]')
>>> matches
[<Element TX at 0x7fbfdbf50370>]
>>> matches[0].find('Tx_WGS84_Longitude').text
'-105.0846057'

有没有一种方法可以使用 python 通过 elementtree 中的 id 属性过滤 xml

Is there a way to filter xml by an id attribute in elementtree using python

python

xml

if-statement

elementtree

python-3.x