'Sends custom options to a specific column in the table.
Args:
index (int): Which column to reformat. The column index is
given from 0 to Ncolumns-1.
Kwargs:
Column options as per `EvCell.__init__`.
Raises:
Exception: if an invalid index is found.'

def reformat_column(self, index, **kwargs):

    if (index > len(self.table)):
        raise Exception('Not    a    valid    column    index')
    self.table[index].options.update(kwargs)
    self.table[index].reformat(**kwargs)
