def _build_index(self):
        raise Exception(
            'Abstract method _build_index called in LayerFile.  This method needs to be overridden.')
Figure out what type of content is in each column
dataset/ETHPy150Open modflowpy/flopy/flopy/utils/datafile.py/LayerFile._build_index--crossover with--dataset/ETHPy150Open learntextvis/textkit/textkit/coerce.py/get_column_types