In QtCore.py, there are several lines where QTextStreamManipulator.exec_ is defined for PyQt5, PyQt6, and PySide6:

QTextStreamManipulator.exec_ = lambda self, *args, **kwargs: self.exec(*args, **kwargs)

However, in neither PyQt5 nor PyQt6 has QTextStreamManipulator.exec or QTextStreamManipulator.exec_ method. So, the fix-up makes no sense. So does the test part.

I'm far too lazy to dig for the origins of the lines. But still, as they don't help, should they be removed?