[Python-ideas] ABC: what about the method arguments ? (original) (raw)
Georg Brandl g.brandl at gmx.net
Fri Sep 24 09:15:00 CEST 2010
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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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