Returns key for the bottommost rightmost cell with content

        Parameters
        ----------
        table: Integer, defaults to None
        \tLimit search to this table

def get_last_filled_cell(self, table=None):
        """Returns key for the bottommost rightmost cell with content

        Parameters
        ----------
        table: Integer, defaults to None
        \tLimit search to this table

        """

        maxrow = 0
        maxcol = 0

        for row, col, tab in self.dict_grid:
            if table is None or tab == table:
                maxrow = max(row, maxrow)
                maxcol = max(col, maxcol)

        return maxrow, maxcol, table