Wait until nested python script ends before continuing in current python script

Question

I have a python script that calls another python script. Inside the other python script it spawns some threads.How do I make the calling script wait until the called script is completely done running?

This is my code :

while(len(mProfiles) < num):
        print distro + " " + str(len(mProfiles))
        mod_scanProfiles.main(distro)
        time.sleep(180)
        mProfiles = readProfiles(mFile,num,distro)
        print "yoyo"

How do I wait until mod_scanProfiles.main() and all threads are completely finished? ( I used time.sleep(180) for now but its not good programming habit)

It doesn't look like you're using the subprocess module. Can you show the code of mod_scanProfiles.main(distro)? — stderr
– stderr, Commented Aug 9, 2012 at 13:00
I am not using the subprocess module indeed... I was guessing I might need to use it to use it so i also tagged it — Synbitz Prowduczions
– Synbitz Prowduczions, Commented Aug 9, 2012 at 13:02
Two approaches: 1) use subprocess instead; 2) change mod_scanProfiles.main() to wait for all threads to finish before returning. Either way shouldn't be too hard. — Jason Orendorff
– Jason Orendorff, Commented Aug 9, 2012 at 13:10
Yeah, since you're not using subprocess you probably just need to do Thread.join to wait. — stderr
– stderr, Commented Aug 9, 2012 at 13:10
To wait for a thread to finish running, use the .join() method. — Jason Orendorff
– Jason Orendorff, Commented Aug 9, 2012 at 13:12

stderr · Accepted Answer · 2012-08-09 13:10:05Z

7

You want to modify the code in mod_scanProfiles.main to block until all it's threads are finished.

Assuming you make a call to subprocess.Popen in that function just do:

# in mod_scanPfiles.main:
p = subprocess.Popen(...)
p.wait() # wait until the process completes.

If you're not currently waiting for your threads to end you'll also want to call Thread.join (docs) to wait for them to complete. For example:

# assuming you have a list of thread objects somewhere
threads = [MyThread(), ...]
for thread in threads:
    thread.start()
for thread in threads:
    thread.join()

answered Aug 9, 2012 at 13:10

stderr

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1 Comment

Synbitz Prowduczions Over a year ago

Thanks for the example code. I used the join function on my thread list and it waits without using the subprocess now :) thnx... didnt know it would be that simple...

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