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クラスに記述子を設定すると記述子が上書きされるのはなぜですか？
簡単な再現： class VocalDescriptor(object): def __get__(self, obj, objtype): print('__get__, obj={}, objtype={}'.format(obj, objtype)) def __set__(self, obj, val): print('__set__') class B(object): v = VocalDescriptor() B.v # prints "__get__, obj=None, objtype=<class '__main__.B'>" B.v = 3 # does not print "__set__", evidently does not trigger descriptor B.v # does not print anything, we overwrote the …