[Python-Dev] One-line abstractmethod function?

[Gregory Salvan]

Hi,
maybe a syntax like that can correspond:

class MyObject(metaclass=ObjectSpec):
    ''' MyObject doc'''
    'attr1 contains something'
    attr1 = None
    'attr2 contains something'
    attr2 = str
    'method1 do something'
    method1 = NotImplementedMethod('self', 'arg1', kwarg1=str)


Metaclass "ObjectSpec" would extend ABCMeta to search class source code for
comments before members assignement,
and replace NotImplementedMethod objects by a corresponding method wich
signature can simply be given by arguments or by ArgSpec, FullArgSpec,
Signature...
with factories like these of "Signature" (from_function, from_builtins...).



2013/12/6 Guido van Rossum <guido at python.org>

> On Thu, Dec 5, 2013 at 6:31 PM, Ethan Furman <ethan at stoneleaf.us> wrote:
> >> On Thu, Dec 05, 2013 at 01:33:00PM -0800, Guido van Rossum wrote:
> >>> Actually if you want to support multiple inheritance of your ABC, your
> >>> abstract methods *must* be no-ops (or have some kind of default
> >>> behavior that can always be done last).
>
> > Done last or first really depends on what the default behavior is,
> doesn't
> > it?  Using __new__ as an example, the chain of calls for that has the
> most
> > ancestorish (yeah, I just made that word up ;) method doing the work
> first,
> > with each less-ancestorish method building on to that as the call chain
> > unwinds.
>
> If you count which call *starts* first, the base class is always
> called later than the subclass (even if it finishes earlier :-).
>
> --
> --Guido van Rossum (python.org/~guido)
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