.parent() vs. parent class in PowerBar example

by Martin Fitzpatrick Last updated PyQt5 FAQ
Heads up! You've already completed this tutorial.

Jerry_Zhou | 2020-05-11 09:20:01 UTC | #1

I don't understand how the class _Bar can get access to the QDial() object defined in the PowerBarclass by using self.parent(). Shouldn't self.parent()be referring to QWidget, the class it is inheriting from?

https://www.pythonguis.com/courses/custom-widgets/creating-your-own-custom-widgets/

Jerry_Zhou | 2020-05-15 14:50:20 UTC | #2

Nevermind! Turns out parent() in Qt has different relationship then superclass to subclass. Instead it is between object instances, and when _Bar is instantiated within PowerBar, the parent() of _Bar refers to the Powerbar class.

Packaging Python Applications with PyInstaller by Martin Fitzpatrick — This step-by-step guide walks you through packaging your own Python applications from simple examples to complete installers and signed executables.

More info Get the book

Well done, you've finished this tutorial! Mark As Complete
[[ user.completed.length ]] completed [[ user.streak+1 ]] day streak

.parent() vs. parent class in PowerBar example was written by Martin Fitzpatrick .

Martin Fitzpatrick has been developing Python/Qt apps for 8 years. Building desktop applications to make data-analysis tools more user-friendly, Python was the obvious choice. Starting with Tk, later moving to wxWidgets and finally adopting PyQt.

.parent() vs. parent class in PowerBar example was published in faq on (updated ) . Feedback & Corrections can be submitted here.

 pyqt5 pyqt python qt qt5