def main():
loader = Loader("qemu:///system", MAAS_OAUTH,
"http://localhost:8000/MAAS/api/1.0/")
loader.get_instances(25, {
'architecture': 'amd64',
'prefix': "juju-",
'memory': 512,
'cpus': 2,
'disk': 1
}, on_failure=on_failure)