[Python-ideas] Proposal: Use mypy syntax for function annotations

[Ethan Furman]

On 08/13/2014 01:19 PM, Guido van Rossum wrote:
> On Wed, Aug 13, 2014 at 12:59 PM, Ethan Furman wrote:
>>
>> -1 on deprecating alternative uses of annotations.
>
> Do you have a favorite alternative annotation use that you actually use (or are likely to)?

My script argument parser [1] uses annotations to figure out how to parse the cli parameters and cast them to 
appropriate values (copied the idea from one of Michele Simionato's projects... plac [2], I believe).

I could store the info in some other structure besides 'annotations', but it's there and it fits the bill conceptually. 
  Amusingly, it's a form of type info, but instead of saying what it has to already be, says what it will become.

--
~Ethan~


[1] https://pypi.python.org/pypi/scription  (due for an overhaul now I've used it for awhile ;)
[2] https://pypi.python.org/pypi/plac/0.9.1