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  1. import abc
  2.  
  3. class ConprehensiveABCMeta(abc.ABCMeta):
  4.     _NOTFOUND = object()
  5.  
  6.     def __new__(metacls, name, bases, namespace, /, **kwargs):
  7.         cls = super().__new__(metacls, name, bases, namespace, **kwargs)
  8.         abstracts = set(cls.__abstractmethods__)
  9.         for name in cls.__abstractmethods__:
  10.             for base in bases:
  11.                 value = getattr(base, name, cls._NOTFOUND)
  12.                 if not (value is cls._NOTFOUND or
  13.                         getattr(value, '__isabstractmethod__', False)):
  14.                     setattr(cls, name, value)
  15.                     abstracts.remove(name)
  16.                     break
  17.         cls.__abstractmethods__ = frozenset(abstracts)
  18.         return cls
  19.  
  20. class ConprehensiveABC(metaclass=ConprehensiveABCMeta):
  21.     pass
  22.  
  23. class A(ConprehensiveABC):
  24.     @abc.abstractmethod
  25.     def x(self):
  26.         pass
  27.  
  28.     def y(self):
  29.         return "A.y"
  30.  
  31.  
  32. class B(ConprehensiveABC):
  33.     @abc.abstractmethod
  34.     def y(self):
  35.         pass
  36.  
  37.     def x(self):
  38.         return "B.x"
  39.  
  40. class AB(B, A):
  41.     pass
  42.  
  43.  
  44. ab = AB()
  45. print(ab.x())
  46. print(ab.y())
Success #stdin #stdout 0.03s 9608KB
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B.x
A.y
https://ideone.com/jFMuII
language:
Python 3 (python  3.9.5)
created:
123 days ago
visibility:
secret

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