在etree.parsed（）之后无法从XML获取值

Posted 2023-02-28

所以我已经用lxml解析了一个xml文件。

import from lxml import etree
In [5]: root = etree.parse(fileXml)
In [6]: root
Out[6]: <lxml.etree._ElementTree at 0x7f2fa63ae388>

如您所见，该对象包含115139条记录...或者至少是我的理解...

In [21]: len(root.getroot())
Out[21]: 115139

如果获得第一个，我确实会看到一些期望的字段：

In [11]: root.getroot()[0].getchildren()
Out[11]: 
[<Element xmlapi_1.0receivedOctetsPeriodic at 0x7f2fa815df88>,
<Element xmlapi_1.0transmittedOctetsPeriodic at 0x7f2fa5b99508>,
<Element xmlapi_1.0inputSpeed at 0x7f2fa5b994c8>,
<Element xmlapi_1.0outputSpeed at 0x7f2fa5b99408>,
<Element xmlapi_1.0timeCaptured at 0x7f2fa5b99348>,
<Element xmlapi_1.0periodicTime at 0x7f2fa5b99148>,
<Element xmlapi_1.0displayedName at 0x7f2fa5b99088>,
<Element xmlapi_1.0monitoredObjectSiteName at 0x7f2fa5b94f48>]

例如，如何检索字段displayedName ...？

例如，我尝试了attrib.get，但没有成功：

In [35]: root.getroot()[0].attrib.get('displayedName').text
---------------------------------------------------------------------------
AttributeError                            Traceback (most recent call last)
<ipython-input-35-653606973e5d> in <module>
----> 1 root.getroot()[0].attrib.get('displayedName').text

AttributeError: 'NoneType' object has no attribute 'text'

这是我要解析的文件的摘录：

<findToFileResponse xmlns="xmlapi_1.0">
    <equipment.SystemCpuMonStats>
        <tmnxSysCpuMonCpuIdle>78.38</tmnxSysCpuMonCpuIdle>
        <tmnxSysCpuMonBusyCoreUtil>21.61</tmnxSysCpuMonBusyCoreUtil>
        <timeCaptured>1587078916040</timeCaptured>
        <children-Set/>
    </equipment.SystemCpuMonStats>

谢谢！

答案

例如，使用此xml：https://www.w3schools.com/xml/simple.xml

root = etree.parse("path")

for object in root.findall('food'):
    name = object.find('name')
    price = object.find('price')
    calories = object.find('calories')
    table = 'name': name.text, 'price': price.text, 'calories': calories
    #Here we changed all the names in the xml to "hi"
    name.text ="hi"
    print(table)

#Here we save the new xml
root.write("path.xml")

作为输出，我们将得到

'name': 'Belgian Waffles', 'price': '$5.95', 'calories': <Element 'calories' at 0x000002704243A368>
'name': 'Strawberry Belgian Waffles', 'price': '$7.95', 'calories': <Element 'calories' at 0x000002704243A548>
'name': 'Berry-Berry Belgian Waffles', 'price': '$8.95', 'calories': <Element 'calories' at 0x000002704243A728>
'name': 'French Toast', 'price': '$4.50', 'calories': <Element 'calories' at 0x000002704243A8B8>
'name': 'Homestyle Breakfast', 'price': '$6.95', 'calories': <Element 'calories' at 0x000002704243AA98>

我希望这会有所帮助！