Stefan Scherfke

The macOS Dark Mode, your Terminal and Vim

MacOS’ new Dark Mode is quite nice, but as a developer, you might also want to switch your Terminal profile and Vim theme – all at the same time, of course …

How to mask an image with a smooth circle in PyQt5

Masking a QPixmap with a smooth circle is not as easily done as one might wish. I’ll show you how to do it with the help of a QImage, a QPainter and a QBrush. I also take care of Retina displays.

Assertions and Exceptions

This article explains the difference between assertions and exceptions and when to use which one.

Advanced asyncio testing

I demonstrate how you can use pytest’s fixture system and the plug-in pytest-asyncio to reduce the boilerplate code required for testing networking libraries.

Testing (asyncio) coroutines with pytest

Pytest currently offers no helpers for testing (asyncio) coroutines. Its powerful plug-in architecture allows you fix that and write elegant tests for coroutines.

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