def layout(self, text, width, align, wrap ):
        raise NotImplementedError("This function must be overridden by a real"
            " text layout class. (see StandardTextLayout)")
>>> interleave_none([0, None, 2, None], [1, 3])
dataset/ETHPy150Open AnyMesh/anyMesh-Python/example/urwid/text_layout.py/TextLayout.layout--crossover with--dataset/ETHPy150Open dask/dask/dask/array/core.py/interleave_none