On Mon, Mar 9, 2009 at 23:35, Dan Korostelev <nad...@gmail.com> wrote:
>> I don't think they are, according to PEP 3107 they are stored in the
>> func_annotations attribute of the function.
> No, they are stored in __annotations__. Look here:
> http://docs.python.org/3.0/whatsnew/3.0.html#new-syntax
> Also:
> n...@seasaw:~$ python3
> Python 3.0.1+ (r301:69556, Feb 24 2009, 13:51:44)
> [GCC 4.3.3] on linux2
> Type "help", "copyright", "credits" or "license" for more information.
>>>> def hello(who:'name') -> None:
> ...     print('Hello, {0}!'.format(who))
> ...
>>>> hello.__annotations__
> {'who': 'name', 'return': None}

Interesting! Perhaps we should file a bug to have the PEP updated with
reality then. ;-)

>> Note that even if the name *where* the same, attribute annotations
>> only work on classes and instances, while function annotations only
>> apply to functions, not?
> Good point. Looks like it is added automatically only for functions/methods. 
> :)
> However, we can't be sure there won't be annotations for any callable
> object, because even PEP says that ``we say function, we mean callable
> object``, so one day we certainly will conflict with something. Also,
> as Gary pointed out, we mis-use the __*__ name pattern that is now
> intended for defining special names that have special meaning for
> python interpreter. And we'll certainly will mis-use the
> __annotations__ name as it's clearly defined in python 3k.
> So, after Gary reminded about __*__ names, I think we shoud use
> something like "_z_annotations".

Semi-agreed. Tools that access ZODB objects and expect __annotations__
to follow the PEP 3107 conventions will be quite surprised. I doubt
that there will be many tools to do so though.

Then again, if Python is now explicitly claiming the __*__ naming
convention, Zope better avoid it's usage. This means we'll have to fix
__parent__ and __name__ usage as well. This will be painful, me

Martijn Pieters
Zope-Dev maillist  -  Zope-Dev@zope.org
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