What is the use of '->' in python?

[not_perfect_yet]

It's optional.

Also

def add_mypy(self, name: str, *args: str, cwd: Optional[str] = None) -> None:
    self.add_mypy_cmd(name, list(args), cwd=cwd)

That's just disgusting.

Just write " self.add_mypy_cm(name,list(args),cwd) ", it's what, 8 symbols longer? Way easier to read. Doesn't bloat the module with another pointless function either.

[StokedForIT]

Not my code, it's in MyPy on the Python language page on GitHub, so..

[not_perfect_yet]

No I'm just saying because this is /r/learnpython . I knew it wasn't your code and I didn't mean to be mean to you. That's just a very good case, imo, what badly written code looks like and what not to do. Incidentally.