QtCreator don't want to run application, JSONDecodeError: running pyside6-metaobjectdump

djdan

Hello!
QtCreator does not want to run an application that I wrote a few months ago on another computer, but in a very similar configuration (also on Windows 10). Interestingly, the application itself works OK if I run it directly from the disk, or e.g. via PyCharm. Does anyone know what the reason could be? Theoretically, I can develop the code without using QtCreator, but I am a person who is terribly irritated by all possible errors. Regards!

15:36:23: Running steps for project NMT...
15:36:23: Starting: "C:\Users\danie\AppData\Roaming\Python\Python311\Scripts\pyside6-project.exe" build
Error parsing C:\DANE\QtProjects\NMT\main.py: 'Constant' object has no attribute 'id'
Traceback (most recent call last):
  File "C:\Users\danie\AppData\Roaming\Python\Python311\site-packages\PySide6\scripts\metaobjectdump.py", line 428, in <module>
    json_data = parse_file(file, context, args.suppress_file)
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "C:\Users\danie\AppData\Roaming\Python\Python311\site-packages\PySide6\scripts\metaobjectdump.py", line 388, in parse_file
    visitor.visit(ast_tree)
  File "C:\Program Files\Python311\Lib\ast.py", line 418, in visit
    return visitor(node)
           ^^^^^^^^^^^^^
  File "C:\Program Files\Python311\Lib\ast.py", line 426, in generic_visit
    self.visit(item)
  File "C:\Program Files\Python311\Lib\ast.py", line 418, in visit
    return visitor(node)
           ^^^^^^^^^^^^^
  File "C:\Users\danie\AppData\Roaming\Python\Python311\site-packages\PySide6\scripts\metaobjectdump.py", line 220, in visit_ClassDef
    self.visit(b)
  File "C:\Program Files\Python311\Lib\ast.py", line 418, in visit
    return visitor(node)
           ^^^^^^^^^^^^^
  File "C:\Users\danie\AppData\Roaming\Python\Python311\site-packages\PySide6\scripts\metaobjectdump.py", line 238, in visit_FunctionDef
    self._parse_function_decorator(node.name, d)
  File "C:\Users\danie\AppData\Roaming\Python\Python311\site-packages\PySide6\scripts\metaobjectdump.py", line 315, in _parse_function_decorator
    type = _python_to_cpp_type(_name(node.args[0]))
                               ^^^^^^^^^^^^^^^^^^^
  File "C:\Users\danie\AppData\Roaming\Python\Python311\site-packages\PySide6\scripts\metaobjectdump.py", line 71, in _name
    return node.id
           ^^^^^^^
AttributeError: 'Constant' object has no attribute 'id'
JSONDecodeError: running pyside6-metaobjectdump on C:\DANE\QtProjects\NMT\main.py: Expecting value: line 1 column 1 (char 0)
15:36:25: The process "C:\Users\danie\AppData\Roaming\Python\Python311\Scripts\pyside6-project.exe" exited with code 1.
Error while building/deploying project NMT (kit: Desktop Qt 6.5.3 MinGW 64-bit)
When executing step "Run PySide6 project tool"
15:36:25: Elapsed time: 00:02.

INFO:
Qt Creator 11.0.3, Based on Qt 6.4.3 (MSVC 2019, x86_64), Built on Sep 27 2023 06:38:22
Python 3.11.6
Windows 10 Home 22H2, latest updates installed

SGaist

Hi,

Can you share a minimal script that triggers this error ?

djdan

Minimal (non)working example:

main.py:

import sys
from pathlib import Path

from PySide6.QtCore import QObject, Signal, Property
from PySide6.QtGui import QGuiApplication
from PySide6.QtQml import QQmlApplicationEngine
import os


class PyBackground(QObject):
    def __init__(self):
        QObject.__init__(self)
        self.d1 = {'0': 'zero', '1': 'one', '2': 'two'}


    property_d1_changed = Signal()

    @Property('QVariant', notify=property_d1_changed)
    def property_d1(self):
        return self.d1

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

main.qml:

import QtQuick
import QtQuick.Controls
import QtQuick.Window


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

    property var d1: py_background.property_d1

    Text {
        id: name
        text: qsTr("text: " + d1['2'])
        x: 20
        y: 20
    }
}

It seems that there is some problem with properties, especially when I want to send python dictionary to qml. Above code is working when run directly from explorer.

SGaist

I just tested this on macOS with Qt Creator 11.0.3 but with Python 3.9.6 and it started successfully.