a class that gets available, running, and stopped services (Ubuntu/Debian)

[Gribouillis]

I would rather return a sequence of small Service objects for such a program, because Python is very strong at manipulating collections and I think it opens more flexible possibilities. Here is a proposal

from collections import namedtuple
import os

class Service(namedtuple('Service', 'name status')):
    __slots__ = ()
    def is_running(self):
        return self.status == '+'
    def is_stopped(self):
        return self.status == '-'
    def has_no_status(self):
        return self.status == '?'

def service_status_all():
    for line in os.popen("service --status-all &> /dev/null"):
        _, status, _, name = line.strip().split()
        yield Service(name, status)
        
if __name__ == '__main__':
    services = list(service_status_all())
    print("{} services are available".format(len(services)))
    for x in services:
        print(x.name)
    running = [s for s in services if s.is_running()]
    print()
    print("{} services are running".format(len(running)))
    for y in running:
        print(y.name)
    stopped = [s for s in services if s.is_stopped()]
    print()
    print("{} services are stopped".format(len(stopped)))
    for y in stopped:
        print(y.name)