def _move_column ( self, frm, to ):
        to_column = None
        if to < len( self.__get_columns() ):
            to_column = self.__get_column( to )

        return self.editor.move_column( self.__get_column( frm ), to_column )

    #---------------------------------------------------------------------------
    #  Protected interface:
    #---------------------------------------------------------------------------
Moves a specified **frm** column to before the specified **to**
dataset/ETHPy150Open enthought/traitsui/traitsui/wx/table_model.py/TableModel._move_column