注释仅在1.2版中受支持 1.2版中的新功能: http://docs.sqlalchemy.org /en/latest/core/metadata.html#sqlalchemy.schema.Column.params.comment

comment only supported in version 1.2 New in version 1.2: http://docs.sqlalchemy.org/en/latest/core/metadata.html#sqlalchemy.schema.Column.params.comment