import time
from threading import Thread

class CountdownTask:
    def __init__(self):
        self._running = True

    def terminate(self):
        self._running = False

    def run(self, n, t):
        while self._running and n > 0:
            print('T-minus', n)
            n -= 1
            time.sleep(t)

countdown1 = CountdownTask()
thread1 = Thread(target=countdown1.run, args=(10, 2))

countdown2 = CountdownTask()
thread2 = Thread(target=countdown2.run, args=(10, 1))

thread1.start()
thread2.start()

#######################
from queue import Queue

# Object that singals shutdown
_sentinel = object()

# A thread that produces data
def producer(out_q, n):
    while n > 0:
        out_q.put(n)
        time.sleep(1)
        n -= 1
    out_q.put(_sentinel)

# A thread that consumes data
def consumer(in_q):
    while True:
        data = in_q.get()
        if data is _sentinel:
            print("Bye...")
            in_q.put(_sentinel)
            break
        else:
            print(data)

q = Queue()
t1 = Thread(target=consumer, args=(q,))
t2 = Thread(target=producer, args=(q, 10))
t1.start()
t2.start()