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[Python-porting] Function annotation syntax for 2.7/3.5 compatibility and pasteurize

Brett Cannon brett at python.org
Fri Dec 23 11:17:31 EST 2016 
On Fri, 23 Dec 2016 at 05:50 Michael Rans via Python-porting <
python-porting at python.org> wrote:

> Hi,
>
> Which is the correct way of doing function annotations that work in 2.7
> and 3.5?
>
> https://www.python.org/dev/peps/pep-0484/#suggested-syntax-for-python-2-7-and-straddling-code
> or
> http://python-future.org/func_annotations.html#func-annotations
> ?
>

The best ways is either the type comment you mention above or
https://www.python.org/dev/peps/pep-0484/#stub-files. The suggestion from
Future will keep the information in the same spot that Python 3 code
expects it to be, it won't work with tools like mypy. So if you're doing it
to access the info at runtime then the Future suggestion works, but if
 you're doing it for type checking you want the other ways (and you can
obviously combine approaches if you want everything :) ).
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