how to make python Qwidget for c++ QtMainWindow?

I have a c++ QMainWindow, and wants to develop more window designs qwidget with python for it.
Perhaps somehow expose QMainwindow's add widget function via CPython?
Could someone point to a example or tell me how to do so? Much appreciated!

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Perhaps somehow expose QMainWindow's add widget function via CPython?

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I think you mean QMainWindow::setCentralWidget(). Since that is not a C++ virtual method, you can't override it in a class derived from QMainWindow. If what you are interested in doing is to use a central widget created in Python, then I think you could probably write a method in your own MainWindow class, call it something like "setMainWidget" and expose it via CPython.

I do not know what a QWidget created in Python "looks like" on the C++ side. If there is a way to convert it into a QWidget pointer, then you can pass that pointer into QMainWindow::setCentralWidget().

exactly my man.

I would like a c++ pointer to the created python QWidget to be add to my c++ mainwindow.

If you are using PySide, then the PySide QWidget has a method winId() which returns a wId handle to the underlying window system window handle (like an HWnd in native Windows code).

On the C++ side, the static method QWidget::find() takes a wId as argument and returns a QWidget pointer. So this could be the solution for you.

You can embed a Python-based QWidget into a C++ QMainWindow by exposing the QMainWindow's addWidget function using Python bindings. This is typically done with PySide6 or PyQt6.

Steps:
1. Expose C++ functions to Python: Use Shiboken (for PySide6) or SIP (for PyQt6) to create bindings for QMainWindow’s addWidget function.
2. Embed Python in C++: Use CPython API (Py_Initialize(), PyImport_ImportModule(), etc.) to run Python code inside C++.
3. Create Python UI Components: Design QWidget in Python and expose it to C++.
4. Load Python Widgets in C++: Use the exposed functions to add Python-based QWidget dynamically.