Python Threading with Event object

Question

I was working on Python scripts that were using Threads in a class and in a particular program, threading.Event() was used a lot. For example:

class TimerClass(threading.Thread):

    def __init__(self):

        threading.Thread.__init__(self)

        self.event = threading.Event()

    def run(self):

        while not self.event.is_set():

            print "something"

            self.event.wait(120)

In the while loop,  I don't know why the code is checking the statement if it doesn't set the self.event?

Answer 1

This is because someone else was setting it. See, you will usually start a thread in one section of your application and continue to do whatever you do:

thread = TimerClass()

thread.start()

# Your task

The thread will perform its own task, while you do your set of tasks. If you want to stop the thread, you just need to call:

thread. event.set()

And the thread will stop.

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