如何使用python查找和更新XML文件内容

我希望我理解你的问题吧，这会发现所有distName="MB-85404/TB-85404/ST-4/[a or b or c]"的标签和替换85404的85409和更新<p name="a">标签：

import re
from bs4 import BeautifulSoup


xml_data = ''' <managedObject class="New" distName="MB-85404/TB-85404/ST-4/a" version="xL20A_1911_002" operation="open">
          <p name="a">320ms</p>
          <p name="b">enabled</p>
          <p name="c">640ms</p>
          <p name="d">320ms</p>
          <p name="e">640ms</p>
          <p name="f">1280ms</p>
          <p name="g">6</p>
    </managedObject>
<managedObject class="new" distName="AL-76867/MB-85404/TB-85404/ST-4/b" version="xL20A_1911_002" operation="open">
          <p name="h">320ms</p>
          <p name="i">enabled</p>
          <p name="j">640ms</p>
          <p name="k">320ms</p>
          <p name="l">640ms</p>
          <p name="a">1280ms</p>
          <p name="l">6</p>
    </managedObject>
<managedObject class="New" distName="MB-85404/TB-85404/ST-4/c" version="xL20A_1911_002" operation="open">
          <p name="a">320ms</p>
          <p name="p">enabled</p>
          <p name="q">640ms</p>
          <p name="r">320ms</p>
          <p name="s">640ms</p>
          <p name="t">1280ms</p>
          <p name="u">6</p>
    </managedObject>'''

soup = BeautifulSoup('<data>' + xml_data + '</data>', 'xml')

r = re.compile(r'^MB-85404/TB-85404/ST-4/(?:a|b|c)')

for o in soup.find_all('managedObject', distName=r):
    o['distName'] = o['distName'].replace('85404', '85409')
    p = o.find('p', {'name':'a'})
    p.string = 'UPDATED ' + p.string

soup.data.unwrap()
print(soup)

印刷品：

<?xml version="1.0" encoding="utf-8"?>
 <managedObject class="New" distName="MB-85409/TB-85409/ST-4/a" operation="open" version="xL20A_1911_002">
<p name="a">UPDATED 320ms</p>
<p name="b">enabled</p>
<p name="c">640ms</p>
<p name="d">320ms</p>
<p name="e">640ms</p>
<p name="f">1280ms</p>
<p name="g">6</p>
</managedObject>
<managedObject class="new" distName="AL-76867/MB-85404/TB-85404/ST-4/b" operation="open" version="xL20A_1911_002">
<p name="h">320ms</p>
<p name="i">enabled</p>
<p name="j">640ms</p>
<p name="k">320ms</p>
<p name="l">640ms</p>
<p name="a">1280ms</p>
<p name="l">6</p>
</managedObject>
<managedObject class="New" distName="MB-85409/TB-85409/ST-4/c" operation="open" version="xL20A_1911_002">
<p name="a">UPDATED 320ms</p>
<p name="p">enabled</p>
<p name="q">640ms</p>
<p name="r">320ms</p>
<p name="s">640ms</p>
<p name="t">1280ms</p>
<p name="u">6</p>
</managedObject>

编辑：要更改85404为85409逢distName=，您可以执行以下操作：

for o in soup.find_all('managedObject', {'distName': True}):
    o['distName'] = o['distName'].replace('85404', '85409')

EDIT2：要替换整个文件：

with open("C:/files/abcd.xml", "r") as f_in:
    xml_data = f_in.read()

with open("C:/files/output.xml", "w") as f_out:
    f_out.write(xml_data.replace("85409","85904"))