Proper PyQt5 signal & slot syntax

[illuzioner1]

Thank you for the response. I had also tried using an instantiated version of the class, but was still getting errors on connect.

It turns out that the line 110 above:
@pyqtSlot

was causing the issue. I don't know why, but when I commented out this line everything worked! It looks like that decorator is only for non-class functions.

Thanks!

[d_stranz]

Maybe it is my ignorance of PyQt and python in general, but where is the instance of ChangeSignals that forms the sending (signal) end of the increase() signal? I see you have defined a global variable named sig that is a ChangeSignals instance, but where is that used in the connect() statement?

The only thing I can imagine is that ChangeSignals.increase.connect() must create a temporary instance of ChangeSignals that provides the signalling end and once __init__ exits this goes out of scope, gets destroyed, and the connection broken. Shouldn't this be "sig.increase.connect()" instead?

[illuzioner1]

No, you didn't miss anything. I went back to the version where I instantiated the class and used that signal, but I didn't update the code in my question. THEN I removed the pyqtSignal decorator.

Sorry to throw you off!