Let's talk about the sub-process mechanism in Python

First, we could create a subprocess by using: 

process_instance = subprocess.Popen(
    ["ping", "google.com"],
    stdout=subprocess.PIPE,
    stderr=subprocess.STDOUT,
    universal_newlines=True,
    preexec_fn=os.setsid
)

Then, you could kill it by using:

pid = process_instance.pid

os.killpg(os.getpgid(pid), signal.SIGINT)  # This is typically initiated by pressing Ctrl+C

# or

os.killpg(os.getpgid(pid), signal.SIGTERM)
os.killpg(os.getpgid(pid), signal.SIGKILL)

---

You could use from multiprocessing import Manager; share_dict = Manager().dict() to share information between different processes or threadings in Python.

with Manager() as manager:
    d = manager.dict()

    p = Process(target=f, args=(d, ))
    p.start()
    p.join()

    print(d)

​