Get return value from each loop of thread

Question

I have a thread with for loop inside that I want to return the value from each loop. But when I put return inside the loop,it break the loop permanently so I can't get other value.

Here is my function:

def track_duration_count(track_length):
    time.sleep(13.2)
    for i in range(0,track_length):
        timer = str(datetime.timedelta(seconds=i))
        #sys.stdout.write(str(i)+' ')
        #sys.stdout.flush()
        return timer
        print (timer)
        time.sleep(1)
        global stop_thread
        if stop_thread:
             break
    print ("BREAKFREE")

I then call the function with:

_thread.start_new_thread(track_duration_count,(track_length,))

I want to use timer from this func for another thread.

Your question is unclear...so please edit it and provide an minimal reproducible example — which may clarify what you're trying to do. — martineau
– martineau, Commented Aug 21, 2019 at 18:46
1) Use a class which inherits from threading.Thread and store the results as an attribute 2) Use multiprocessing.dummy.Pools map function 3) Add the results to a list, since lists will be passed as reference. — Joshua Nixon
– Joshua Nixon, Commented Aug 21, 2019 at 18:57

Simon Notley · Accepted Answer · 2019-08-21 19:20:35Z

1

I'd recommend using a queue to share data between threads. Pass the queue to the function (it will pass the reference not a copy of the queue, that's how Python works) then instead of return use the queue.put() method to place timer in the queue. Your other thread(s) can then retrieve the value using the queue.get() method.

https://docs.python.org/3/library/queue.html

Also is there a reason you're using not using the standard threading.Thread class? It's safer to use this unless you've got some very goof reason to be using the private methods.

edited Aug 21, 2019 at 19:20

answered Aug 21, 2019 at 19:14

Simon Notley

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