what would you say are the limitations of Python type annotations? From the pyco...

deathanatos · on July 1, 2017

* pylint / pep8 doesn't parse comment-based annotations, and thus flags imports that are in use as "unused"

* numbers.Real / Union[float,int] do not work correctly; I basically can't figure a way to annotate a function that takes an int/float/decimal/etc.

(mypy doesn't think "int" is a valid "Real", and it doesn't think you can add two Union[float,int] objects.)

(mypy has nonetheless been very helpful, and overall I would recommend it.)

yorwba · on July 1, 2017

> I basically can't figure a way to annotate a function that takes an int/float/decimal/etc.

It seems like you should be able to just annotate it with float?

... when an argument is annotated as having type float , an argument of type int is acceptable ...

deathanatos · on July 1, 2017

Hmm. I wasn't aware of that; still, it seems to not work for Decimal objects.

slaymaker1907 · on July 1, 2017

You don't need comment based annotations since there are real annotations since python 3.5

make3 · on July 1, 2017

I can't tell if you're neglecting the fact that most production Python is Python 2 on purpose or not

deathanatos · on July 1, 2017

While true, my codebase regrettably needs to run in Python 2.7.