axicli – XMLSyntaxError: Blank needed here

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  • January 14, 2024 at 7:43 pm #30847
    Chris D
    Participant

    Hi

    I’m trying to use axicli to create a ‘plob’, but it gives an error that seems to mean that the SVG is invalid.

    I used Inkscape to create a very simple SVG file, which works fine in preview mode (with ‘–preview’), but with ‘–digest 2 -o output_plob.svg’ it gives a long traceback ending with

    lxml.etree.XMLSyntaxError: Blank needed here, line 1, column 21

    The SVG file starts with

    <?xml version=”1.0″ encoding=”UTF-8″ standalone=”no”?>
    <!– Created with Inkscape (http://www.inkscape.org/) –>
    …

    I’m using AxiDraw Command Line Interface 3.9.6, AxiDraw Software 3.9.6, Python 3.11 on Arch Linux.

    I can supply all the gory details if required. Has anyone else seen this issue?

    Cheers,

    Chris

    January 14, 2024 at 7:56 pm #30853
    Windell Oskay
    Keymaster

    I am able to reproduce the issue, and I will look into it.

    January 14, 2024 at 8:50 pm #30854
    Windell Oskay
    Keymaster

    This appears to be due to a bug in the latest release of lxml.

    Try: python3 -m pip uninstall lxml

    Then, python3 -m pip install lxml==4.9.4

    January 15, 2024 at 7:41 pm #30860
    Chris D
    Participant

    Thanks for your reply. You’re probably right, but I’m struggling with versions of Python libraries: the ‘EXTERNALLY-MANAGED’ feature of pip (see e.g. https://bbs.archlinux.org/viewtopic.php?id=286788) means that I have to install everything that AxiDraw needs in a new Python virtual environment using pipx, and that insists on giving me the latest version of lxml (5.1), so I’m still seeing the error.

    I’ll report back once I’ve got my head round this Python library versioning mystery.

    January 15, 2024 at 7:44 pm #30868
    Windell Oskay
    Keymaster

    Hmm. We don’t have experience with pipx, so I’m not sure why that’s requiring a specific lxml version.

    We’re planning to pin the lxml requirement in the next point release unless they fix that upstream.

    January 16, 2024 at 1:58 am #30869
    Chris D
    Participant

    Aha! I just had to edit AxiDraw’s setup.py to change

    ‘lxml>=4.9.3’,

    to

    ‘lxml==4.9.3’,

    Then I just ran

    pipx install .

    and it’s all working again.

    Trying to specify the lxml version on the pipx command line didn’t work.

    January 16, 2024 at 3:30 am #30870
    Windell Oskay
    Keymaster

    Great. That’s the type of change that we are planning for the software if the upstream bug doesn’t get resolved promptly.

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