How can I make my classes provide explanations for failed assertions?

[MaddyGuthridge]

I understand that it is possible to give custom assertion messages by defining a pytest_assertrepr_compare in the conftest.py for every project that uses these classes, but I would much rather define it once in the package I am distributing and have it be automatically used in the project's dependents without requiring any action from them. Is there a way I can cleanly do this?

[The-Compiler]

You could ship a pytest plugin with your project, which implements that hook.

[MaddyGuthridge]

Thanks, I got it working!