python xml：具有特定属性值的子元素的xpath

Question

I need an xpath expression for the following:

All nodes with the tag "test" that have a child with the tag "status" that have an attribute called "status" with the value "PASS"

so with the xml below, I need to get the node with the id "s1-t1". I should be able to modify this so that instead of Passed tests, I get tests with the attribute [@status='FAIL'] . I've tried a couple things to no avail:

• ".//test/[@status='PASS']" returns nothing
• ".//test/[status][@status='PASS']" returns nothing
• ".//test//[status][@status='PASS']" throws a SyntaxError("invalid descendant")
• ".//test//status[@status='PASS']" returns 2 status nodes (one for the test status and one for the keyword status)
• ".//test//status[@status='PASS']/../.." returns the correct test node, but also the suite node

I'm not sure what to try at this point. Here's the XML I'm working on:

<?xml version="1.0" encoding="UTF-8"?>
<robot generated="20151111 16:29:28.630" generator="Robot 2.9.1 (Python 2.7.10 on cygwin)">
<suite source="/cygdrive/c/test/robot/thing.robot" id="s1" name="Thing">
<test id="s1-t1" name="Case1">
<kw name="Should Contain" library="BuiltIn">
<doc>Fails if ``item1`` does not contain ``item2`` one or more times.</doc>
<arguments>
<arg>hello</arg>
<arg>hell</arg>
</arguments>
<status status="PASS" endtime="20151111 16:29:28.689" starttime="20151111 16:29:28.689"></status>
</kw>
<status status="PASS" endtime="20151111 16:29:28.689" critical="yes" starttime="20151111 16:29:28.688"></status>
</test>
<test id="s1-t2" name="Case2">
<kw name="Should Contain" library="BuiltIn">
<doc>Fails if ``item1`` does not contain ``item2`` one or more times.</doc>
<arguments>
<arg>hello</arg>
<arg>elo</arg>
</arguments>
<msg timestamp="20151111 16:29:28.690" level="FAIL">'hello' does not contain 'elo'</msg>
<status status="FAIL" endtime="20151111 16:29:28.690" starttime="20151111 16:29:28.690"></status>
</kw>
<status status="FAIL" endtime="20151111 16:29:28.690" critical="yes" starttime="20151111 16:29:28.690">'hello' does not contain 'elo'</status>
</test>
<test id="s1-t3" name="Case3">
<kw name="Should Contain" library="BuiltIn">
<doc>Fails if ``item1`` does not contain ``item2`` one or more times.</doc>
<arguments>
<arg>hello</arg>
</arguments>
<msg timestamp="20151111 16:29:28.691" level="FAIL">Keyword 'BuiltIn.Should Contain' expected 2 to 4 arguments, got 1.</msg>
<status status="FAIL" endtime="20151111 16:29:28.691" starttime="20151111 16:29:28.691"></status>
</kw>
<status status="FAIL" endtime="20151111 16:29:28.691" critical="yes" starttime="20151111 16:29:28.691">Keyword 'BuiltIn.Should Contain' expected 2 to 4 arguments, got 1.</status>
</test>
<status status="FAIL" endtime="20151111 16:29:28.692" starttime="20151111 16:29:28.633"></status>
</suite>
<statistics>
<total>
<stat fail="2" pass="1">Critical Tests</stat>
<stat fail="2" pass="1">All Tests</stat>
</total>
<tag>
</tag>
<suite>
<stat fail="2" id="s1" name="Thing" pass="1">Thing</stat>
</suite>
</statistics>
<errors>
</errors>
</robot>

Answer 1

You are almost there:

.//test[status/@status = "PASS"]

This is exactly All nodes with the tag "test" that have a child with the tag "status" that have an attribute called "status" with the value "PASS" .