获取 XML 中的注释节点

Question

Env: Python 3.9.7, Windows 10

How can I get XPATHs of the commented nodes?

---

Example XML (ex.xml)

<?xml version="1.0"?>
<data>
    <country name="Liechtenstein">
        <rank updated="yes">2</rank>
        <year>2008</year>
        <gdppc>141100</gdppc>
        <neighbor name="Austria" direction="E">AUS</neighbor>
        <!-- A1 -->
        <neighbor name="Switzerland" direction="W">SWI</neighbor>
    </country>
    <country name="Singapore">
        <rank updated="yes">5</rank>
        <year>2011</year>
        <gdppc>59900</gdppc>
        <!-- B1 -->
        <neighbor name="Malaysia" direction="N"/>
    </country>
</data>

---

What I expect

import xml.etree.ElementTree as et

def parse_commented_nodes(root):
    """
    Returns something like
    {
        "A1" : "./country[@name='Liechtenstein']/neighbor[@name='Austria']",
        "B1" : "./country[@nmae='Singapore']/gdppc"
    }
    """
    return {}

tree = et.parse("ex.xml")
root = tree.getroot()
res = parse_commented_nodes(root)

---

My idea

1. Read the file as a text.
2. Find the lines which comes before a comment.
3. Get parents iteratively from the nodes up to the root.

But I have a problem 'getting parents' from the above method. For example,

annotated_node = root.find(".//neighbor[@name='Austria']")
print(annotated_node.find("..")) # None
print(annotated_node.find("./..")) # None

I have searched ways to get parents (or get full XPATH) of a node using the default xml module of Python but couldn't find an effective one.

---

How to read commented text from XML file in python

My question is similar with the above but not a duplicate. It finds 'comments' but I need 'nodes before comments.'

Answer 1

Problem solved by using lxml as @mzjn suggested.

from lxml import etree as et

def parse_commented_nodes(tree):
    res = {}
    for node in tree.iter():
        if "function Comment" in str(node.tag):
            res[node.text] = tree.getpath(node.getprevious())
    return res

tree = et.parse("ex.xml")
res = parse_commented_nodes(tree)