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I am very sorry, I just noticed another mistake.
It should be:
 A dotted lookup such as ``super(A, obj).x`` (where ``obj``
 is an instance of ``A`` or of a subclass of ``A``) searches
 ``type(obj).__mro__`` for such a base class ``B`` that follows
 ``A`` and whose :attr:`__dict__` contains the name ``"x"``;
 then ``B.__dict__['x'].__get__(obj, type(obj))`` is returned.
 If not a descriptor, ``B.__dict__['x']`` is returned unchanged.