parse xml file and return list of specific variables

Question

I'm trying to extract a list of X,Y,Z from xml file. A part of xml is:

 <Data>
      <TargetPosition X="57.23471787820652" Y="-26.04271457691532" 
Z="9.988092935592704" Valid="1"/> #PosLang
      <StartPosition X="0" Y="0" Z="0" Valid="0"/>
    </Data>
  </Object>
  <Object Type="{aa99a9ec-4b85-442e-b914-de3579656eb5}">
    <ParentTObject Valid="1">
      <Translation X="0" Y="0" Z="0"/>
      <Rotation W="1" X="0" Y="0" Z="0"/>
    </ParentTObject>
    <Data>
      <TargetPosition X="58.81901290773406" Y="-20.09883392050945" 
Z="16.53197054898237" Valid="1"/> #NegLang
      <StartPosition X="0" Y="0" Z="0" Valid="0"/>
    </Data>
  </Object>

I need to extract X,Y,Z from all TargetPosition in file that have #PosLang comment

def targets(path='some.xml'):
    try:
        e = ET.parse(path).getroot()
    except FileNotFoundError:
        return list()

    Position = namedtuple('float', ['x', 'y', 'z'])

    for position in e.iter('TargetPosition'):
        yield Position(
            x=float(position.get('X')), 
            y=float(position.get('Y')),
            z=float(position.get('Z'))
        )

In y code i extract X,Y,Z of all TargetPosition, but i need only that have #PosLang comment

Don't confuse Python comments using # and XML comments.

Parfait
– Parfait

2019-04-24 13:00:38 +00:00
Commented Apr 24, 2019 at 13:00 — Parfait
– Parfait, Commented Apr 24, 2019 at 13:00

Tomalak · Accepted Answer · 2019-04-24 12:55:46Z

4

If your XML really contains the string #PosLang in exactly the way your sample shows, then that's not a comment, but a regular text node.

And since that text node follows the <TargetPosition> element, it will be in the .tail property:

def targets(path='some.xml'):
    try:
        e = ET.parse(path).getroot()
    except FileNotFoundError:
        return list()

    Position = namedtuple('float', ['x', 'y', 'z'])

    for position in e.iter('TargetPosition'):
        if "#PosLang" in position.tail:
            yield Position(
                x=float(position.get('X')), 
                y=float(position.get('Y')),
                z=float(position.get('Z'))
            )

answered Apr 24, 2019 at 12:55

Tomalak

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2 Comments

Relyativist Over a year ago

Exception appears: if "#PosLang" in position.tail: ^ TabError: inconsistent use of tabs and spaces in indentation

Tomalak Over a year ago

You seem to be using tabs to indent your Python source code. Don't do that. The convention is that Python indentation is four spaces - update your editor's settings, make whitespace visible, fix the errors in your code indentation.

brunns · Accepted Answer · 2019-04-24 12:48:29Z

0

As per the docs, ElementTree ignores XML comments. Can you get the XML generated differently?

answered Apr 24, 2019 at 12:48

brunns

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3 Comments

Relyativist Over a year ago

The problem is that it should be commented after generated. Because it should be marked as "negative" or "positive"

Tomalak Over a year ago

What is the criterion? When is a position "postive" and when is it "negative"?

Relyativist Over a year ago

Heuristicly, xml comes from neuronavigation system, it only produces points, without labeling them, if there was “language” response from person it will be positive, visa-versa

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