How to get parents and grand parents tags given specific attribute in XML in python? - python-3.x

Question

I have an xml with a structure like this one:
<cat>
<foo>
<fooID>1</fooID>
<fooName>One</fooName>
<bar>
<barID>a</barID>
<barName>small_a</barName>
<barClass>
<baz>
<qux>
<corge>
<corgeName>...</corgeName>
<corgeType>
<corgeReport>
<corgeReportRes Reference="x" Channel="High">
<Pos>1</Pos>
</corgeReportRes>
</corgeReport>
</corgeType>
</corge>
</qux>
</baz>
</barClass>
</bar>
<bar>
<barID>b</barID>
<barName>small_b</barName>
<barClass>
<baz>
<qux>
<corge>
<corgeName>...</corgeName>
<corgeType>
<corgeReport>
<corgeReportRes Reference="y" Channel="High">
<Pos>1</Pos>
</corgeReportRes>
</corgeReport>
</corgeType>
</corge>
</qux>
</baz>
</barClass>
</bar>
</foo>
<foo>
<fooID>2</fooID>
<fooName>Two</fooName>
<bar>
<barID>c</barID>
<barName>small_c</barName>
<barClass>
<baz>
<qux>
<corge>
<corgeName>...</corgeName>
<corgeType>
<corgeReport>
<corgeReportRes Reference="z" Channel="High">
<Pos>1</Pos>
</corgeReportRes>
</corgeReport>
</corgeType>
</corge>
</qux>
</baz>
</barClass>
</bar>
</foo>
</cat>
And, I would like to obtain the values of specific parent/grand parent/grand grand parent tags that have a node with attribute Channel="High". I would like to obtain only fooID value, fooName value, barID value, barName value.
I have the following code in Python 3:
import xml.etree.ElementTree as xmlET
root = xmlET.parse('file.xml').getroot()
test = root.findall(".//*[#Channel='High']")
Which is actually giving me a list of elements that match, however, I still need the information of the specific parents/grand parents/grand grand parents.
How could I do that?
fooID | fooName | barID | barName
- - - - - - - - - - - - - - - - -
1 | One | a | small_a <-- This is the information I'm interested
1 | One | b | small_b <-- Also this
2 | Two | c | small_c <-- And this
Edit: fooID and fooName nodes are siblings of the grand-grand-parent bar, the one that contains the Channel="High". It's almost the same case for barID and barName, they are siblings of the grand-parent barClass, the one that contains the Channel="High". Also, what I want to obtain is the values 1, One, a and small_a, not filtering by it, since there will be multiple foo blocks.

Answer 1

If I understand you correctly, you are probably looking for something like this (using python):
from lxml import etree
foos = """[your xml above]"""
items = []
for entry in doc.xpath('//foo[.//corgeReportRes[#Channel="High"]]'):
items.append(entry.xpath('./fooID/text()')[0])
items.append(entry.xpath('./fooName/text()')[0])
items.append(entry.xpath('./bar/barID/text()')[0])
items.append(entry.xpath('./bar/barName/text()')[0])
print('fooID | fooName | barID | barName')
print(' | '.join(items))
Output:
fooID | fooName | barID | barName
1 | One | a | small_a