pyQt QLayout issue

Question

This is driving me a little crazy. Hope someone can clear this up for me. Running the following code results in the first print statement being a list with one element the QVBoxLayout object. I set two objects to layout why do I get only one?

The second print statement gives two objects the QHBoxLayout and QPushButton. Isn't QPushButton a child of layout?

I would expect layout.children() to give me two objects QPushButton and QVBoxLayout and self.children() to give me one object QHBoxLayout. What am I missing?

from PySide.QtGui import *
import sys

class Main(QWidget):

    def __init__(self, parent=None):
        super(Main, self).__init__(parent)

        layout = QHBoxLayout(self)
        layout.addWidget(QPushButton("foo"))

        layout.addLayout(QVBoxLayout())

        print layout.children()
        print self.children()

app = QApplication([])
main = Main()
main.show()
sys.exit(app.exec_())

Answer 1

I guess the note from the documentation explains this clearly enough:

Note: Widgets in a layout are children of the widget on which the layout is installed, not of the layout itself. Widgets can only have other widgets as parent, not layouts.