PyQt5 Problem on MacOS Big Sur SOLVED

If you are a Python developer on a Mac, here is a nasty surprise: The latest PyQt5 release (5.15) doesn’t work on Big Sur (yet).

When you start your Python application, all you see is a blank slate and your CPU running at 100%.

The workaround is simple: Downgrade your PyQt5 to 5.13.

pip install PyQt5==5.13

This solved the issue on three of my Python applications:

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