Standardization Recommendation: Use Function annotations for method arguments and return types

(WG) #1

See this excellent SO response for an idea on what this is and where it is helpful:

You can see how folks like @hamelsmu use them here:

While they don’t throw exceptions if you pass in the wrong type, they’re nice because of the implicit in-line documentation they provide the user. You know exactly what the method wants and what is going to be returned without having to read through the documentation.


(urmas pitsi) #2

I would love to have fully statically type checked python code, using mypy (‘’). It seems to get more and more traction.

ps. by ‘…read through the documentation…’ you probably meant ‘read through the source code’ :slight_smile:

(WG) #3

Actually, I think I meant a little of both. It’s nice to not have to search the docstring to know what values you can and cannot assign to method arguments and also what to expect to get when the method returns.

And yah, mypy is getting a lot of traction.

(Jeremy Howard) #4

Yup we’ll be doing this :slight_smile: