def __sub__(self, other):
        if not isinstance(other, Set):
            if not isinstance(other, Iterable):
                return NotImplemented
            other = self._from_iterable(other)
        return self._from_iterable(value for value in self
                                   if other not in value)
dataset/ETHPy150Open azoft-dev-team/imagrium/env/Lib/_abcoll.py/Set.__sub__/swapped operands of `not in`