def cell_type(self, row, col):
        return 'heading' if row == 0 else 'data'
if there is only one type found
dataset/ETHPy150Open ioam/holoviews/holoviews/core/element.py/Tabular.cell_type--crossover with--dataset/ETHPy150Open learntextvis/textkit/textkit/coerce.py/pick_type