If my editor can't tell me what type a variable is, someone has messed up

This means that inputs need type hints, and outputs can hopefully be type inferred.

In Python especially this is frustrating because many libraries do not provide comprehensive type definitions that are automatically assigned (looking at you SQLAlchemy v1.4). This means you will have to annotate yourself.

Life is so much better if you do this. For everyone involved. Turn on Pyright type checking, get angry when you see red squiggles.

# VERY BAD
async def run(self, params={}):
    pass

Python makes @dataclasses and TypedDict really easy to use, I recommend them highly.

Further reading: The CMD-Click Manifesto