How to embed QDialog into QWidget ?

[Anonymous_Banned275]

I am looking at this

https://stackoverflow.com/questions/17163585/simple-way-to-embed-a-qdialog-into-a-qwidget

here it the part I like to use - I am trying to improve my knowledge of QMdiArea. Unfortunately the code has no expiation / comments. It seem "backwards" as far as defining
the variables.
I could use some assistance decoding the purpose each line of code , maybe then I can convert the code to real C++ code,

widget = QWidget()
mdiarea = QMdiArea()
layout = QVBoxLayout(widget)
layout.addWidget(mdiarea)
d = QInputDialog()
d.setLabelText("test2")
d.setInputMode(QInputDialog.TextInput)
w = mdiarea.addSubWindow(d)
w.show()
widget.show()

i made some progress ... I think the example is pseudo
code ....

   // attach dialog to this form
     widget = new  QWidget();
     widget->setWindowTitle(" Window titke (widget) attach dialog to this form");
     // show floating widget
     widget->show();
     // create mdi area
     mdiarea = new QMdiArea();

     // create widget basic layout
     layout = new QVBoxLayout(widget);

     // add mdiarea into layput
      layout->addWidget(mdiarea);
      
      
      d = QInputDialog()
      d.setLabelText("test2")
      d.setInputMode(QInputDialog.TextInput)
      w = mdiarea.addSubWindow(d)
      w.show()
      widget.show()