#! @python3@/bin/python3

from contextlib import ExitStack
from pystemd.systemd1 import Manager, Unit


def main():
    with Manager(_autoload=True) as manager:
        active_prev = manager.Manager.ListUnits()
        ids = [ unit[0] for unit in active_prev]
        with ExitStack() as stack:
            units = [stack.enter_context(Unit(external_id=id_, _autoload=True)) for id_ in ids]
            print(len(units))


if __name__ == "__main__":
    main()