Python hokus-pokus

items = db().select('items', project_id=project_id, in_history=0)

for item in items:
    child_ids = [int(id) for id in item.children.split(',')]

    if ids == child_ids:
        new_list = filter(lambda x: x not in ids, child_ids)
        db().update('items', id=item.id, children=','.join(new_list))