Qt causes Python's Py_Main to no-op on Windows

Bug report

There is a a very weird bug with Python 3.10.4 and Qt (both 5.15.2 and 6.3.0) such that if you reference any non-trivial Qt classes or methods (such as qIsFinite, QString, or QVector) on Windows, trying to call Py_Main (or Py_BytesMain) will result in a no-op (the program will immediately exit 0 and not show the Python interactive shell). Furthermore, the bug is absent on MacOS. I have linked a minimal example of the bug at https://github.com/Landmaster/python-embed-qt-bug. The corresponding bug report on the QT side is at https://bugreports.qt.io/browse/QTBUG-103734.

Your environment

• CPython versions tested on: 3.10.4
• Operating system and architecture: Windows 11

Inizia con l’esempio minimo collegato su Windows 11 usando CPython 3.10.4 e Qt 5.15.2 o 6.3.0, confrontando Py_Main e Py_BytesMain con e senza riferimenti Qt non banali. Leggi il report QTBUG-103734 collegato e determina la causa; il lavoro è completato quando il programma incorporato non termina più silenziosamente invece di mostrare la shell interattiva.