When running PyQt5 app in Spyder it always exits with -1

Question

I am learning to program with PyQt5. No troubles with that, but there is one annoying issue: when I start the app, I immediately get the message that an exception occurred a

Answer 1

(Spyder maintainer here) When you run programs in Spyder you're doing it in interactive mode, meaning that you don't need to add a sys.exit call at the end of them, because that simply tries to kill the process responsible for running your code.

That's precisely what this warning is telling you:

warn("To exit: use 'exit', 'quit', or Ctrl-D.", stacklevel=1)

It means that to exit an IPython session you need to follow one of the above methods, instead of using sys.exit.

The solution to this problem (which has been asked a lot of times already) is in our wiki.