[Python-ideas] A decorator to call super()

[Joao S. O. Bueno]

BTW, if one can come up with a pure-Python
 implementation for these, I'd like to take a peek at the code, please.

On 31 January 2017 at 13:57, Joao S. O. Bueno <jsbueno at python.org.br> wrote:
> On 31 January 2017 at 13:05, Thomas Kluyver <thomas at kluyver.me.uk> wrote:
>> On Tue, Jan 31, 2017, at 02:32 PM, Stephen J. Turnbull wrote:
>>> Personally, I don't think the explicit invocation is such a big deal
>>> to need a standardized decorator in the stdlib.
>>
>> +1. It's one line either way, and the explicit call to super() seems
>> clearer for people reading the code.
>
> I agree that the explict call to super() is clear and concise enough
> - moreover you are in full control of
> where to call, plus what parameters to forward.
>
> BUT - no, it is _not_ an easy decorator to craft - and I don't think
> it can be made to work
> cleanly without depending on implementation details of cPython.
>
> I've been hitting the Python shell for 40+ minutes now, trying to get,
> in pure Python, a way
> for a method decorator to get a reference to the superclass in the way
> "super" does - it is not feasible
> without a metaclass. (I mean...it may be feasable, but one will be
> tough - one does not have a reference
> to the superclasses inside a class body as it is being parsed - I
> tried to trick the Python runtime into
> creating an empty __class__ cell in the decorator body for a decorator
> defined outside the class, and have
> that filled in, but it does not work as well).
>
> Still, such @pre_super and @post_super decorators might be something
> cute to have around - and
> can't be made in a trivial way either on the code base or on a
> pure-python 3rd party package.
>
> I would say I am +0 to "+0.5" on them.
>
>
>     js
>   -><-