Interface and duck typing woes

[Steven D'Aprano]

On Fri, 30 Aug 2013 06:35:47 -0400, Roy Smith wrote:

> In article <52200699$0$6599$c3e8da3$5496439d at news.astraweb.com>,
>  Steven D'Aprano <steve+comp.lang.python at pearwood.info> wrote:
> 
>> These days, it would be relatively simple to implement pre- and post-
>> condition checking using decorators, and indeed one of the motivating
>> use- cases for function annotations in Python 3 is to allow such
>> things.
>> 
>> http://www.python.org/dev/peps/pep-3107/
>> 
>> (Function annotations are perhaps the best Python feature that nobody
>> uses.)
> 
> This is awesome.


Heh, everybody has one of two reactions: 

"This is awesome!"

"You'll add type checking to my Python code over my dead body!!!"

But I'm still to see a practical use for annotations in real world code. 
Or indeed to think of a use for them other than type checking.


-- 
Steven