Thread Based Parallelism - Thread in a Subclass

　　
 1     import threading

     import time

     exit_Flag = 0

     class myThread (threading.Thread):

         def __init__(self, threadID, name, counter):

             threading.Thread.__init__(self)

             self.threadID = threadID

             self.name = name

             self.counter = counter

         def run(self):

             print ("Starting " + self.name + "\n")

             print_time(self.name, self.counter, 5)

             print ("Exiting " + self.name + "\n")

     def print_time(threadName, delay, counter):

         while counter:

             if exit_Flag:

                 thread.exit()

             time.sleep(delay)

             print ("%s: %s" % (threadName, time.ctime(time.time())))

             counter -= 1

     if __name__ == '__main__':

         # Create two threads

         thread1 = myThread(1, "Thread-1", 1)

         thread2 = myThread(2, "Thread-2", 2)

         # Start the Threads created

         thread1.start()

         thread2.start()

         # Wait for all thread to complete

         thread1.join()

         thread2.join()

         print ("Exiting Main Thread")

     Output,

         Starting Thread-1

         Starting Thread-2

         Thread-1: Thu Feb  8 15:08:47 2018

         Thread-1: Thu Feb  8 15:08:48 2018

         Thread-2: Thu Feb  8 15:08:48 2018

         Thread-1: Thu Feb  8 15:08:49 2018

         Thread-2: Thu Feb  8 15:08:50 2018

         Thread-1: Thu Feb  8 15:08:50 2018

         Thread-1: Thu Feb  8 15:08:51 2018

         Exiting Thread-1

         Thread-2: Thu Feb  8 15:08:52 2018

         Thread-2: Thu Feb  8 15:08:54 2018

         Thread-2: Thu Feb  8 15:08:56 2018

         Exiting Thread-2

         Exiting Main Thread