I use Type hints and using mypy strictly. Huge fan of dataclasses as well. Most of the python I write is functions / functional + data classes with type hinte

I use Type hints and using mypy strictly. Huge fan of dataclasses as well. Most of the python I write is functions / functional + data classes with type hinted everything and it seems to work nicely and make writing tests for functions very easy. Using black, isort, mypy, pylint, pytest, makes every project simpler.