serial_thds.py

import threading
from threading import Thread
import time


class ThreadManager:
    def __init__(self):
        self.thread_queue = []
        thm = Thread(target=self.thread_serializer)
        thm.daemon = True
        thm.start()
        

    def thread_serializer(self):
        while True:
            time.sleep(0.1)
            if self.thread_queue:
                th = self.thread_queue[0]
                th.start()
                th.join()
                self.thread_queue.pop(0)
            else:
                pass

        
class Tests:
    def test1(self):
        print 'Test1'
        for i in range(10):
            time.sleep(1)

    def test2(self):
        print 'Test2'
        for i in range(10):
            time.sleep(1)

    def test3(self):
        print 'Test3'
        for i in range(10):
            time.sleep(1)

Tests = Tests()
ThreadManager = ThreadManager()

testThread1 = Thread(target=Tests.test1)
ThreadManager.thread_queue.append(testThread1)
testThread2 = Thread(target=Tests.test2)
ThreadManager.thread_queue.append(testThread2)
testThread3 = Thread(target=Tests.test3)
ThreadManager.thread_queue.append(testThread3)