First create a client instance with your credentials:
>>> import ceilometerclient.client
>>> cclient = ceilometerclient.client.get_client(VERSION, os_username=USERNAME, os_password=PASSWORD, os_tenant_name=PROJECT_NAME, os_auth_url=AUTH_URL)
Here VERSION should be: 2.
Then call methods on its managers:
>>> cclient.meters.list()
[<Meter ...>, ...]
>>> cclient.new_samples.list()
[<Sample ...>, ...]
Use queries to narrow your search (more info at Ceilometer V2 API reference):
>>> query = [dict(field='resource_id', op='eq', value='5a301761-f78b-46e2-8900-8b4f6fe6675a'), dict(field='meter',op='eq',value='cpu_util')]
>>> cclient.new_samples.list(q=query, limit=10)
[<Sample ...>, ...]
For more information, see the reference: