How to dispose all resources after PythonQt correctly?

[iakov]

Long story short: an attempt to Py_FinalizeEx() after PythonQt::cleanup() crashes an app. (Can be easily reproduced in PythonQtTests)

Because the former releases a lot of objects (even the self), but there are still registered callbacks there (for wrappers) that in turn are called when the latter (finalization) decreases references and attempts to release the bound C++ object.

[iakov]

I have a version of PythonQt that does not leak with Qt5.15. Patched version of PythonQt is here: https://github.com/trikset/trik-pythonqt

Warning

My version of PythonQt can dispose only on correct tests. Some additional improvements required to cleanup for bad cases. For example, references to sleeping timer's callback like Qt.QTimer.singleShot(100, lambda: None) leaks in my patched version.