Issues with QtQuick Controls with on PySide 6

teabag

I had a project on PySide2, which worked just fine until I decided to install PySide6. After fixing most of the stuff I started getting the very unhelpful error messages:

The program has unexpectedly finished.
The process was ended forcefully.
/Library/Frameworks/Python.framework/Versions/3.9/bin/python3 crashed.

I didn't really see anything wrong with the project, so I created a blank project which worked just fine. However, same messages as above appeared as soon as I added some controls (e.g. button), which I believe to be the source of the issue.

I'm running the following:

MacOS Big Sur 11.5.2 (latest)
Python 3.9.6
PySide 6.1.2

I installed Qt using the online installer with the following options selected:

Design Tools (Qt Design Studio)
Qt 6.1 for desktop development (Qt libraries for clang)

Here are some example files:

main.qml

import QtQuick
import QtQuick.Window
import QtQuick.Layouts
import QtQuick.Controls

Window {
    width: 640
    height: 480
    visible: true
    title: qsTr("Hello World")

    RowLayout {
        id: rowLayout
        anchors.fill: parent

        Button {
            id: btn
        }

    }

}

main.py

import os
from pathlib import Path
import sys

from PySide6.QtGui import QGuiApplication
from PySide6.QtQml import QQmlApplicationEngine


if __name__ == "__main__":
    app = QGuiApplication(sys.argv)
    engine = QQmlApplicationEngine()
    engine.load(os.fspath(Path(__file__).resolve().parent / "main.qml"))
    if not engine.rootObjects():
        sys.exit(-1)
    sys.exit(app.exec())

main.pyproject

{
    "files": ["main.py", "main.qml"]
}

teabag

Found the source of the issue. There must have been a conflict with my Python installs - I had both the one from the website and one with Homebrew. I completely removed both and then reinstalled with Homebrew and all seems to be working fine now.

ndias

No problems detected on my side running your sample code using:

Windows 10 (x64)
Python 3.7.7 (x64)
PySide 6.1.2

teabag

I believe it might be a Mac related issue. Found the same thing on stack overflow - https://stackoverflow.com/questions/66492343/pyside6-comes-with-segmentation-fault-on-mac

teabag

Found the source of the issue. There must have been a conflict with my Python installs - I had both the one from the website and one with Homebrew. I completely removed both and then reinstalled with Homebrew and all seems to be working fine now.