[Python-ideas] ABC: what about the method arguments ?
Georg Brandl
g.brandl at gmx.net
Fri Sep 24 09:15:00 CEST 2010
Am 23.09.2010 16:37, schrieb Tarek Ziadé:
> Hello,
>
> ABC __subclasshook__ implementations will only check that the method
> is present in the class. That's the case for example in
> collections.Container. It will check that the __contains__ method is
> present but that's it. It won't check that the method has only one
> argument. e.g. __contains__(self, x)
>
> The problem is that the implemented method could have a different list
> of arguments and will eventually fail.
I'm not concerned about this in the least. Whoever implements a special
method with the wrong signature has more pressing problems than a false-
positive ABC subclass check. And AFAIK, our ABCs only check for special
methods.
> Using inspect, we could check in __subclasshook__ that the arguments
> defined are the same than the ones defined in the abstractmethod.--
> the name and the ordering.
"ordering"?
Georg
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