def regions():
    """
    Get all available regions for the SDB service.

    :rtype: list
    :return: A list of :class:`boto.sdb.regioninfo.RegionInfo` instances
    """
    return [SDBRegionInfo(name='us-east-1',
                          endpoint='sdb.amazonaws.com'),
            SDBRegionInfo(name='eu-west-1',
                          endpoint='sdb.eu-west-1.amazonaws.com'),
            SDBRegionInfo(name='us-west-1',
                          endpoint='sdb.us-west-1.amazonaws.com'),
            SDBRegionInfo(name='sa-east-1',
                          endpoint='sdb.sa-east-1.amazonaws.com'),
            SDBRegionInfo(name='us-west-2',
                          endpoint='sdb.us-west-2.amazonaws.com'),
            SDBRegionInfo(name='ap-northeast-1',
                          endpoint='sdb.ap-northeast-1.amazonaws.com'),
            SDBRegionInfo(name='ap-southeast-1',
                          endpoint='sdb.ap-southeast-1.amazonaws.com')
            ]
Get all available regions for the SDB service.

    :rtype: list
    :return: A list of :class:`boto.sdb.regioninfo.RegionInfo` instances