@classmethod
    def unregister_hdu(cls, hducls):
        if cls._hdu_registry in hducls:
            cls._hdu_registry.remove(hducls)
dataset/ETHPy150Open spacetelescope/PyFITS/pyfits/hdu/base.py/_BaseHDU.unregister_hdu/swapped operands of `in`