Breaking it down

In the preceding example, we start off by defining a very simplistic function called myThread, which will be the target of the threads that we are about to create. Within this function, we simply print that the thread has started, and then we wait for a random interval between 1 and 5 seconds before printing that the thread is terminating.

We have then defined a main function which creates four distinct thread objects, and then starts them off. Once we've finished creating and starting these threads, we then print out the results of threading.enumerate(), which should output something like this:

    $ python3.6 07_enumerateThreads.py
    Thread 0: started
    Thread 1: started
    Thread 2: started
    Thread 3: started
    Enumerating: [<_MainThread(MainThread, started 140735793988544)>,
    <Thread(Thread-1, started 123145554595840)>, <Thread(Thread-2, 
    started 123145559851008)>, <Thread(Thread-3, started 
    123145565106176)>, <Thread(Thread-4, started 123145570361344)>] 
    Thread 2: finished
    Thread 3: finished
    Thread 0: finished
    Thread 1: finished