[Python-ideas] Expose __abstractmethods__/__isabstractmethod__ in abc

[Andrew Barnert]

On Jul 25, 2014, at 16:34, Nick Coghlan <ncoghlan at gmail.com> wrote:
> The additional module level functions sound like a good idea to me. I see it as similar to the functools.singledispatch driven addition to expose a way to obtain a cache validity token for the virtual object graph.
> 
Another reason the function seems better than the attribute.

The only advantage to the attribute is that we could document that it already existed in 3.4 and earlier, instead of just documenting a new function. And if that was desirable we could always add that as a note to the documentation of the function.
> I thought "__isabstractmethod__" was already documented though, since we rely on it to control the pass through behaviour of property and other decorators like classmethod and staticmethod. If it isn't, that's really a bug rather than an RFE.
> 
You're right; I was looking for it in the wrong place. It doesn't document that abstract methods created by @abstractmethod have that attribute, but it does document that if you want to create an abstract method manually you have to set it, and shows how @property both uses and exposes the attribute, which is more than enough. So, never mind that part.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://mail.python.org/pipermail/python-ideas/attachments/20140725/b700b1b0/attachment.html>