Marcin Kozak

I' am happy to see that. I lack time to contribute to the package the way it deserves.

Thanks. Please gimme some time to review this - and I will try to make this time reasonable. Please let me know in what environments (OSs) you checked this.

And which Python version? We need to check it in all main Python 3.6 and higher versions. I will check also on Linux. I added a comment to the merge...

I am not sure about that. An exception suggests that this is an error indeed. Showing a message does not suggest that. Having said that, I agree that the traditional...

Yes. But I am not sure these should be separate tests, as in order to run such a test, you need to create the package. So, this should be tested...