Eric Snow added the comment:
Both abstractnethod and abstractproperty work by setting __isabstractmethod__
to True on the decorated function. Then type.__new__ looks for any attributes
of the current class (including inherited ones) that have __isabstractmethod__
set to True. The signature of abstract methods is not checked/enforced. In
fact the overriding attribute doesn't even have to be a method at all. PEP
3119 doesn't say much about this. I expect it is the way the way it is for
performance reasons.
As to SuperSubber working in Python 3, don't forget that metaclasses are
declared in the class signature:
class SuperSubber(META):
pass
Doing things like enforcing signatures is doable, but would require some other
mechanism. If you want to pursue this further I recommend you take it to the
python-ideas mailing list.
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nosy: +eric.snow
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<http://bugs.python.org/issue20897>
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