AttributeError: 'NoneType' object has no attribute '_dial'

by Martin Fitzpatrick Last updated Sep 17 PyQt5 FAQ

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anonymous | 2020-05-11 09:21:56 UTC | #1

When I try running demo I get the following error

python

dial = self.parent()._dial
AttributeError: 'NoneType' object has no attribute '_dial'

I am running on Windows.

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

Virginia | 2020-05-12 14:19:00 UTC | #2

I had this error too, and it turned out it was because I put the paint event in the PowerBar class instead of the _Bar class.

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AttributeError: 'NoneType' object has no attribute '_dial' 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. Martin founded PythonGUIs to provide easy to follow GUI programming tutorials to the Python community. He has written a number of popular https://www.martinfitzpatrick.com/browse/books/ on the subject.

AttributeError: 'NoneType' object has no attribute '_dial' was published in faq on May 11, 2020 (updated September 17, 2024) . Feedback & Corrections can be submitted here.

pyqt5 pyqt python qt qt5