XML 解析帮助 Python lxml、etree 或 dom

Question

我一直在尝试从库文档中解析 XML 响应，但无法确定找到我想要的值的简单方法。我将使用任何通用库。

字符串格式的示例 XML 响应：

<entry
       xmlns="http://www.w3.org/2005/Atom"
       xmlns:s="http://dev.splunk.com/ns/rest"
       xmlns:opensearch="http://a9.com/-/spec/opensearch/1.1/">
  <title>search index</title>
  <id>https://localhost:8089/services/search/jobs/mysearch_02151949</id>
  <updated>2011-07-07T20:49:58.000-07:00</updated>
  <link href="/services/search/jobs/mysearch_02151949" rel="alternate"/>
  <published>2011-07-07T20:49:57.000-07:00</published>
  <link href="/services/search/jobs/mysearch_02151949/search.log" rel="search.log"/>
  <link href="/services/search/jobs/mysearch_02151949/events" rel="events"/>
  <link href="/services/search/jobs/mysearch_02151949/results" rel="results"/>
  <link href="/services/search/jobs/mysearch_02151949/results_preview" rel="results_preview"/>
  <link href="/services/search/jobs/mysearch_02151949/timeline" rel="timeline"/>
  <link href="/services/search/jobs/mysearch_02151949/summary" rel="summary"/>
  <link href="/services/search/jobs/mysearch_02151949/control" rel="control"/>
  <author>
    <name>admin</name>
  </author>
  <content type="text/xml">
    <s:dict>
      <s:key name="cursorTime">1969-12-31T16:00:00.000-08:00</s:key>
      <s:key name="delegate"></s:key>
      <s:key name="diskUsage">2174976</s:key>
      <s:key name="dispatchState">DONE</s:key>
      <s:key name="doneProgress">1.00000</s:key>
      <s:key name="dropCount">0</s:key>
      <s:key name="earliestTime">2011-07-07T11:18:08.000-07:00</s:key>
      <s:key name="eventAvailableCount">287</s:key>
      <s:key name="eventCount">287</s:key>
      <s:key name="eventFieldCount">6</s:key>
      <s:key name="eventIsStreaming">1</s:key>
      <s:key name="eventIsTruncated">0</s:key>
      <s:key name="eventSearch">search index</s:key>
      <s:key name="eventSorting">desc</s:key>
      <s:key name="isDone">1</s:key>

我已经截断了输出，我想要的两个值是文本值：

• name="isDone" (1)
• name="doneProgress" (1.00000)
• name="eventCount" (287)

如何找到这些数值？

Answer 1

您可以使用lxml 和xpath：

ns = {'s':"http://dev.splunk.com/ns/rest"}
print xml.xpath("//s:key[@name='isDone']/text()", namespaces=ns)

这将打印[1]。完整示例：

xml = '''
<entry
       xmlns="http://www.w3.org/2005/Atom"
       xmlns:s="http://dev.splunk.com/ns/rest"
       xmlns:opensearch="http://a9.com/-/spec/opensearch/1.1/">
  <title>search index</title>
  <id>https://localhost:8089/services/search/jobs/mysearch_02151949</id>
  <updated>2011-07-07T20:49:58.000-07:00</updated>
  <link href="/services/search/jobs/mysearch_02151949" rel="alternate"/>
  <published>2011-07-07T20:49:57.000-07:00</published>
  <link href="/services/search/jobs/mysearch_02151949/search.log" rel="search.log"/>
  <link href="/services/search/jobs/mysearch_02151949/events" rel="events"/>
  <link href="/services/search/jobs/mysearch_02151949/results" rel="results"/>
  <link href="/services/search/jobs/mysearch_02151949/results_preview" rel="results_preview"/>
  <link href="/services/search/jobs/mysearch_02151949/timeline" rel="timeline"/>
  <link href="/services/search/jobs/mysearch_02151949/summary" rel="summary"/>
  <link href="/services/search/jobs/mysearch_02151949/control" rel="control"/>
  <author>
    <name>admin</name>
  </author>
  <content type="text/xml">
    <s:dict>
      <s:key name="cursorTime">1969-12-31T16:00:00.000-08:00</s:key>
      <s:key name="delegate"></s:key>
      <s:key name="diskUsage">2174976</s:key>
      <s:key name="dispatchState">DONE</s:key>
      <s:key name="doneProgress">1.00000</s:key>
      <s:key name="dropCount">0</s:key>
      <s:key name="earliestTime">2011-07-07T11:18:08.000-07:00</s:key>
      <s:key name="eventAvailableCount">287</s:key>
      <s:key name="eventCount">287</s:key>
      <s:key name="eventFieldCount">6</s:key>
      <s:key name="eventIsStreaming">1</s:key>
      <s:key name="eventIsTruncated">0</s:key>
      <s:key name="eventSearch">search index</s:key>
      <s:key name="eventSorting">desc</s:key>
      <s:key name="isDone">1</s:key>
    </s:dict>
  </content>
</entry>
'''

from lxml import etree
from cStringIO import StringIO

xml = StringIO(xml)
xml = etree.parse(xml)
ns = {'s':"http://dev.splunk.com/ns/rest"}
print xml.xpath("//s:key[@name='isDone']/text()", namespaces=ns)