docs/examples/compute/register_3rd_party_driver.py

from libcloud.compute.providers import get_driver
from libcloud.compute.providers import set_driver


set_driver('stratuslab',
           'stratuslab.libcloud.stratuslab_driver',
           'StratusLabNodeDriver')

# Your code which uses the driver.
# For example:
driver = get_driver('stratuslab')