def __init__(self, _type, input):
        assert _type in types.ALL_TYPES
        self._type = _type
        UnaryOperator.__init__(self, input)
@return: an iterator of all the ancestors of this path, from the most
dataset/ETHPy150Open uwescience/raco/raco/expression/expression.py/CAST.__init__--crossover with--dataset/ETHPy150Open kuri65536/python-for-android/python-modules/twisted/twisted/python/filepath.py/_PathHelper.parents