def get_cell_lines(self, column_idx):
        '''
            ''returns:
            the lines of the cell specified by the column_idx or an empty list if the column does not exist
        '''
        return [] if column_idx >= len(self.columns) else self.columns[column_idx].get_cell_lines()
def get_cell_lines ( self , column_idx ) : return [ ] if column_idx >= len ( self . columns ) else self . columns [ column_idx ] . get_cell_lines ( )
''returns:
            the lines of the cell specified by the column_idx or an empty list if the column does not exist