Question

Here is what I have, from a garbage-collection/proper cleanup perspective:

class MyWidget(QWidget):
    def __init__(self,qtParent):
        QWidget.__init__(self,qtParent):
        
        self.mySubWidget = MySubWidget(self)  # <-- keeping a direct reference to the child

When I destroy MyWidget, will mySubWidget also get correctly destroyed by Qt/pyside/python when I call the code below?

setAttribute( Qt.DeleteOnClose, True)
myWidget.close()

Or, should I use weakrefs like below?

import weakref

class MyWidget(QWidget):
    def __init__(self,qtParent):
        QWidget.__init__(self,qtParent):
        
        self.mySubWidget = weakref.ref(MySubWidget(self))

Answer 1

The first one is fine. If you don’t have any other reference to the created MySubWidget outside of your instance, then it will be garbage collected when you delete the MyWidget instance.