def _check_colname_in_lst(column_name, columns_names):
    if column_name in columns_names:
        msg = 'Cannot add a relation with column "{}" which is undefined'
        raise RelationNoColException(msg.format(column_name))
dataset/ETHPy150Open Alexis-benoist/eralchemy/eralchemy/parser.py/_check_colname_in_lst/operator `not in` -> `in`