[py-dev] Using funcargs with decorators

[holger krekel]

Hi Anto,

On Thu, Oct 11, 2012 at 22:10 +0200, Antonio Cuni wrote:
> Hi Holger, Sebastian,
> 
> On 10/11/2012 03:16 PM, holger krekel wrote:
> > ah, now i get it.  You want to assign the function back.
> > That is indeed not going to work as pytest then sees the rollback
> > function (i assume you return another function from this decorator).
> > What is the decorator-returned function doing?  
> 
> I admit I did not follow the discussion deeply. However, if the problem is
> that py.test sees the decorated function (which presumably uses *args and
> **kwargs) instead of the original one, it can be solved by using the same
> technique I used for enforceargs in pypy:
> 
> https://bitbucket.org/pypy/pypy/src/7f6d5c878b90/pypy/rlib/objectmodel.py#cl-170
> 
> in practice, the trick is to exec() a function def with the correct argument
> list instead of just relying on *args, **kwargs. This way, py.test should be
> able to find the correct signature.

I agree that is one way to solve it.  However, if "hiding" the
function can be avoided alltogether, then it's even better.

On a sidenote, i am not sure Python's decorator design was such
a great idea.  Maybe it should have been restricted to setting attributes
(like C# and also java IIRC) and then a way to get those attributed
functions on a per-class, per-module or even global basis.

best,
holger