this no workie workie

gistfile1.txt

def upgrade(migrate_engine):
    meta = MetaData(bind=migrate_engine)
    services = Table('services', meta, autoload=True)
    if not hasattr(services.c, 'uuid'):
        services.create_column(Column('uuid', String(36), nullable=True))

    uuid_index_name = 'services_uuid_idx'
    indexes = Inspector(migrate_engine).get_indexes('services')
    if uuid_index_name not in (i['name'] for i in indexes):
        services = Table('services', meta, autoload=True)
        Index(uuid_index_name, services.c.uuid, unique=True).create()

    service_list = list(services.select().execute())
    for s in service_list:
        LOG.error("service: %s", service)
        s.update().where(services.c.uuid == None).values(uuid=six.text_type(uuid.uuid4())).execute()