Weird QProxyStyle TypeError on Python 3.12

[Charles]

I also experienced this when trying qdarktheme (
https://github.com/5yutan5/PyQtDarkTheme), running on python 3.11 64 bit,
Windows 10, PyQt6-6.5.3.dev2309101249-cp37-abi3-win_amd64.whl

TypeError: arguments did not match any overloaded call:
  QProxyStyle(style: typing.Optional[QStyle] = None): not enough arguments
  QProxyStyle(key: Optional[str]): not enough arguments

Probably because key is a reference

QProxyStyle::QProxyStyle(const QString &key)

To fix it I have to pass None as the parameter. So maybe None match a null
pointer but it does not match a null? reference. Can a reference even be
null?

On Thu, Sep 21, 2023 at 2:52 PM Florian Bruhin <me at the-compiler.org> wrote:

> Hey,
>
> With CPython 3.12.0rc1 and PyQt 6.5.2 on Fedora 39 Beta 1.1, it looks
> like it's impossible to create a QProxyStyle with no arguments.
>
> A "docker run -it fedora:39" followed by:
>
>     dnf install python-pyqt6
>     python3 -c 'from PyQt6.QtWidgets import QProxyStyle; s = QProxyStyle()'
>
> Results in:
>
>     TypeError: arguments did not match any overloaded call:
>       QProxyStyle(style: typing.Optional[QStyle] = None): not enough
> arguments
>       QProxyStyle(key: Optional[str]): not enough arguments
>
> Using QProxyStyle(None) seems to work as a workaround.
>
> For some reason, I can *not* reproduce this right now on Archlinux with
> Python 3.12.0rc2 (but Python 3.12.0rc3 on Fedora also reproduces it,
> *and* I've seen this exact error on Archlinux earlier this week, so not
> sure yet what triggers it).
>
> Florian
>
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