Problems loading python plugins into qt designer

[Zbigniew Reszela]

Hello again,

We just discovered (thanks Benjamin!) that the incompatibility starts 
when using newer Qt version.

When using qt 5.12 the plugins are visible in the designer: mamba create 
-y -n qt512 qt=5.12

When using qt 5.15 the plugins are *not* visible: mamba create -y -n 
qt515 qt=5.15

Do you have any hint on where to report this issue or how to solve it?

Thanks,

Zibi


On 9/11/23 13:30, Zbigniew Reszela wrote:
> Dear all,
>
> I have experienced problems loading python plugins into the Qt Designer.
>
> I follow this guide on developing custom python plugins: 
> https://www.riverbankcomputing.com/static/Docs/PyQt5/designer.html#writing-qt-designer-plugins.
>
> I can not even load the example plugins that comes with the PyQt5 
> source package.
>
> I use the latest PyQt5 and Qt5 packages available on conda-forge:
>
> OS: Debian 11
>
> python (conda) = 3.11.5
>
> Qt5 = 5.15.8
>
> PyQt5 = 5.15.9
>
> I execute it in the following way:
>
> ╰─>$ PYTHONPATH=/PyQt5-5.15.9/examples/designer/plugins/widgets 
> PYQTDESIGNERPATH=/PyQt5-5.15.9/examples/designer/plugins/python/ designer
>
> Do you know what could be wrong?
>
> Do you know how could I debug this problem?
>
> I don't see that the plugins are even attempted to be loaded, no 
> __pycache__ dir is generated with pyc files.
>
> I was thinking on adding some prints in the 
> /PyQt5-5.15.9/designer/pluginloader.cpp, compiling and somehow linking 
> it with the designer. Any hint on that?
>
> Note, when I use some older versions of PyQt5 and Qt5 from some older 
> conda environment I prepared in the past it works correctly and I can 
> see the plugins loaded in the designer, the same using the Debian 11 
> packages:
>
> OS: Debian 11
>
> python (conda) = 3.9.2
>
> Qt5 = 5.12.9
>
> PyQt5 = 5.12.3
>
> Here I can see __pycache__ dir with pyc files.
>
> Many thanks in advance for any kind of help,
>
> Regards,
>
> Zibi
>
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