There's more than 1 class of problems that unit tests solve though. I'd still want pretty good testing over my business logic heavy code. I'd also like to point

There's more than 1 class of problems that unit tests solve though. I'd still want pretty good testing over my business logic heavy code. I'd also like to point out that Python's typing module + mypy is, while still not perfect, quite good as a tacked-on type system. Also I believe unit tests as a concept first gained popularity in the Java ecosystem, not Python, which kind of negates the assertion that they are popularized because of Python's typing shortcomings.