post.py

import random
import time
import uuid

import pyrax


pyrax.set_credential_file('/whatever')
pyrax.queues.client_id = str(uuid.uuid4())

pid_gen = lambda: str(random.randint(1, 999999))



while True:
    project = pid()
    body = {'start': 1, 'end': 2, 'type': 'usage', 'total': 100,
            'project_id': project, 'event_id': str(uuid.uuid4()),
            'data_center': 'ORD1'}
    print('Posting on behalf of %s' % project)
    pyrax.queues.post_message('tasks', ttl=120, body=body)

Needs time.sleep(1) above.