When using:

import clr_loader
clr_loader.get_coreclr()

If the loading fails, we merely get this error:

RuntimeError: Could not find a suitable hostfxr library in /usr/local/share/dotnet

This is not very easy to debug because we don't know why the hostfxr might not be suitable.

The culprit is this piece of code, which just silences the error:

I get that, in the logic of the code, if a runtime is found, we don't want to display a whole bunch of clutter... But in the case where no runtime was found, it seems helpful to have some more details?

For instance, after digging, I found that the reason the runtime was not loading was:

(mach-o file, but is an incompatible architecture (have 'arm64', need 'x86_64'))

Because Python is a universal binary, it is a bit unpredictable whether it is ran as arm64 or x86_64, and because .NET is available in the two flavours.... but the installed files don't seem to be marked with the architecture... that makes the whole thing a little tricky to debug.