def _get_not_supported_column(col_name_col_instance, column_name):
    try:
        column = col_name_col_instance[column_name]
    except KeyError:
        msg = _("Please specify column %s in col_name_col_instance "
                "param. It is required because column has unsupported "
                "type by SQLite.")
        raise exception.ColumnError(msg % column_name)

    if not isinstance(column, Column):
        msg = _("col_name_col_instance param has wrong type of "
                "column instance for column %s It should be instance "
                "of sqlalchemy.Column.")
        raise exception.ColumnError(msg % column_name)
    return column
dataset/ETHPy150Open openstack/oslo.db/oslo_db/sqlalchemy/utils.py/_get_not_supported_column/original