def __new__(cls, *args, **kwds):
        assert cls is not Base, "Cannot instantiate Base"
        return object.__new__(cls)
Method to accept a list of values and append to flat list.
dataset/ETHPy150Open ctxis/canape/CANAPE.Scripting/Lib/lib2to3/pytree.py/Base.__new__--crossover with--dataset/ETHPy150Open AltSchool/dynamic-rest/dynamic_rest/viewsets.py/QueryParams.add