Exactly this. In Haskell, I can look at a function signature or definition and be guaranteed a lot of what that function is or is not able to do without needing

Exactly this. In Haskell, I can look at a function signature or definition and be guaranteed a lot of what that function is or is not able to do without needing to look at the code it's calling. That's never going to be the case with Python. I can only, at most, trust the conventions the writer seems to be following.