# code3.py

import threading

import time

class Worker(threading.Thread):

def __init__(self, t):

super().__init__()

self.t = t

def run(self):

print("{} starting...".format(threading.currentThread().getName()))

time.sleep(self.t)

print("{} exiting...".format(threading.currentThread().getName()))

class Service(threading.Thread):

def __init__(self, t):

super().__init__()

self.t = t

def run(self):

print("{} starting...".format(threading.currentThread().getName()))

time.sleep(self.t)

print("{} exiting...".format(threading.currentThread().getName()))

# Creating threads

t1 = Service(5)

w1 = Worker(2)

w2 = Worker(4)

# Starting threads

t1.start()

w1.start()

w2.start()

# Here we call the join() method to block the main program.

# The other threads keep running independently

t0 = time.time()

w1.join()

print('Main program waits for: {}'.format(time.time() - t0))