用Python minidom解析xml

Question

我试图用Python minidom库解析.xml文件中的元素，但似乎不起作用。它返回"IndexError list out of range“。也许我使用的方法/库不正确。请建议如何执行此操作。谢谢

from xml.dom import minidom
doc = minidom.parse('/path/to/file/runParameters.xml')
docs = doc.getElementsByTagName('RunParameters')
for el in docs:
    cloud = el.getElementsByTagName("EnableCloud")
    print(cloud[0].firstChild.nodeValue)

下面是该文件的结构

<?xml version="1.0"?>
<RunParameters xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <EnableCloud>false</EnableCloud>
  <RunParametersVersion>MiSeq</RunParametersVersion>
  <CopyManifests>true</CopyManifests>
  <FlowcellRFIDTag>
    <SerialNumber>000000000-AG01C</SerialNumber>
    <PartNumber>17772</PartNumber>
    <ExpirationDate>2016-04-10T00:00:00</ExpirationDate>
  </FlowcellRFIDTag>
</RunParameters>

Answer 1

使用ElementTree

import xml.etree.ElementTree as ET


xml = '''<?xml version="1.0"?>
<RunParameters xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <EnableCloud>false</EnableCloud>
  <RunParametersVersion>MiSeq</RunParametersVersion>
  <CopyManifests>true</CopyManifests>
  <FlowcellRFIDTag>
    <SerialNumber>000000000-AG01C</SerialNumber>
    <PartNumber>17772</PartNumber>
    <ExpirationDate>2016-04-10T00:00:00</ExpirationDate>
  </FlowcellRFIDTag>
</RunParameters>'''

root = ET.fromstring(xml)
print(root.find('.//EnableCloud').text)

输出

false

Answer 2

这段代码适用于我。请在您的系统上试用：

xx = '''
<?xml version="1.0"?>
<RunParameters xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <EnableCloud>false</EnableCloud>
  <RunParametersVersion>MiSeq</RunParametersVersion>
  <CopyManifests>true</CopyManifests>
  <FlowcellRFIDTag>
    <SerialNumber>000000000-AG01C</SerialNumber>
    <PartNumber>17772</PartNumber>
    <ExpirationDate>2016-04-10T00:00:00</ExpirationDate>
  </FlowcellRFIDTag>
</RunParameters>
'''.strip()

with open('test2.xml','w') as f:
   f.write(xx)
   
from xml.dom import minidom
doc = minidom.parse('test2.xml')
docs = doc.getElementsByTagName('RunParameters')
for el in docs:
    cloud = el.getElementsByTagName("EnableCloud")
    print(cloud[0].firstChild.nodeValue)

输出

false