def main():
    connection.default()

    # Management functions would normally be used in development, and possibly for deployments.
    # They are typically not part of a core application.
    log.info("### creating keyspace...")
    management.create_keyspace_simple(KEYSPACE, 1)
    log.info("### syncing model...")
    management.sync_table(FamilyMembers)

    # default uuid is assigned
    simmons = FamilyMembers.create(surname='Simmons', name='Gene', birth_year=1949, sex='m')

    # add members to his family later
    FamilyMembers.create(id=simmons.id, surname='Simmons', name='Nick', birth_year=1989, sex='m')
    sophie = FamilyMembers.create(id=simmons.id, surname='Simmons', name='Sophie', sex='f')

    nick = FamilyMembers.objects(id=simmons.id, surname='Simmons', name='Nick')
    try:
        nick.iff(birth_year=1988).update(birth_year=1989)
    except LWTException:
        print "precondition not met"

    # showing validation
    try:
        FamilyMembers.create(id=simmons.id, surname='Tweed', name='Shannon', birth_year=1957, sex='f')
    except __HOLE__:
        log.exception('INTENTIONAL VALIDATION EXCEPTION; Failed creating instance:')
        FamilyMembers.create(id=simmons.id, surname='Tweed', name='Shannon', sex='f')

    log.info("### add multiple as part of a batch")
    # If creating many at one time, can use a batch to minimize round-trips
    hogan_id = uuid4()
    with BatchQuery() as b:
        FamilyMembers.batch(b).create(id=hogan_id, surname='Hogan', name='Hulk', sex='m')
        FamilyMembers.batch(b).create(id=hogan_id, surname='Hogan', name='Linda', sex='f')
        FamilyMembers.batch(b).create(id=hogan_id, surname='Hogan', name='Nick', sex='m')
        FamilyMembers.batch(b).create(id=hogan_id, surname='Hogan', name='Brooke', sex='f')

    log.info("### All members")
    for m in FamilyMembers.all():
        print m, m.birth_year, m.sex

    log.info("### Select by partition key")
    for m in FamilyMembers.objects(id=simmons.id):
        print m, m.birth_year, m.sex

    log.info("### Constrain on clustering key")
    for m in FamilyMembers.objects(id=simmons.id, surname=simmons.surname):
        print m, m.birth_year, m.sex

    log.info("### Constrain on clustering key")
    kids = FamilyMembers.objects(id=simmons.id, surname=simmons.surname, name__in=['Nick', 'Sophie'])

    log.info("### Delete a record")
    FamilyMembers(id=hogan_id, surname='Hogan', name='Linda').delete()
    for m in FamilyMembers.objects(id=hogan_id):
        print m, m.birth_year, m.sex

    management.drop_keyspace(KEYSPACE)
dataset/ETHPy150Open datastax/python-driver/example_mapper.py/main