[Windows] PySide2 not working with Python-3.8+

[julien-hdev]

Platform: Windows 10 Rez version: 2.103.4

This issue is not Rez-dependent but this is strongly related to its way of working (separated packages).

TL;DR

As far as I know, the use of PySide2 with Python-3.8+ via Rez seems impossible on Windows.

Description

I recently installed Rez on my Windows 10 computer. To follow the VFX Platform recommendations, I wanted to work with Python-3.9 and PySide2-5.15.

After installing PySide2 (and its dependency shiboken2) via rez-pip, I tried to run a Python shell and to import PySide2. I instantly got an exception coming from the PySide2\__init__.py file. Actually, as we can see in the code right here, when using Python-3.8+, the file tries to deal with relative paths from PySide2 to find the shiboken directory and, because it does not find it, it raises this exception.

I am not sure this is the good place to talk about this but I thought it was quite relevant to notice.

[PaoloFazio]

Had and still have the same problem. By now I've just moved shiboken2 in the PySide2 package to make it work, but of course I'm not happy with it.

[hughetop]

If you're using python 3.8, I highly suggest you update to python 3.9+ to follow the VFX platform. Now the PySide2 problem: I've seen this too, and the only way I found to fix it is to copy the shiboken2 module to the python directory in the PySide2 package. So you'll have:

...\packages\ext\PySide2\5.15.2.1\<variants>\python
 PySide2
 shiboken2

It's not ideal, but the shiboken2 module is fairly small and this has worked for me. Just make sure you copy the correct version of shiboken2.