AttributeError: 'MainWindow' object has no attribute 'onWindowTitleChange'

by Martin Fitzpatrick Last updated PyQt5 faq
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Jomali_3945 | 2020-05-07 14:43:37 UTC | #1

While running your example, I get the error: AttributeError: 'MainWindow' object has no attribute 'onWindowTitleChange'

https://www.pythonguis.com/courses/start/signals-slots-events/

Wu_Yi | 2020-05-07 14:45:26 UTC | #2

I had the same problem, it seems that this signal is no longer available in the Qt QMainWindow class.

martin | 2020-05-10 09:41:25 UTC | #3

The onWindowTitleChange is a custom-defined slot (see the bottom of the example file) which you need to add yourself. The signal windowTitleChange is connected to this.

python 
# SLOT: This accepts a string, e.g. the window title, and prints it
def onWindowTitleChange(self, s):
    print(s)

Wu_Yi | 2020-05-10 09:41:24 UTC | #4

Thanks, that makes sense.

tashasummers5448 | 2020-07-21 20:49:05 UTC | #5

I got the same error but my mistake was that I had copy/pasted the slots into the same indent level as the class MainWindow instead of the indent level of the def __init__. It worked once I moved them over.

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AttributeError: 'MainWindow' object has no attribute 'onWindowTitleChange' was published in faq on (updated )

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