I have a main process which creates two or more sub processes, I want main process to wait until all sub processes finish their operations and exits?

 # main_script.py

 p1 = subprocess.Popen(['python script1.py']) 
 p2 = subprocess.Popen(['python script2.py'])
 ... 
 #wait main process until both p1, p2 finish
 ...

A Popen object has a .wait() method exactly defined for this: to wait for the completion of a given subprocess (and, besides, for retuning its exit status).

If you use this method, you'll prevent that the process zombies are lying around for too long.

(Alternatively, you can use subprocess.call() or subprocess.check_call() for calling and waiting. If you don't need IO with the process, that might be enough. But probably this is not an option, because your if the two subprocesses seem to be supposed to run in parallel, which they won't with (call()/check_call().)

If you have several subprocesses to wait for, you can do

exit_codes = [p.wait() for p in p1, p2]

(or maybe exit_codes = [p.wait() for p in (p1, p2)] for syntactical reasons)

which returns as soon as all subprocesses have finished. You then have a list of return codes which you maybe can evaluate.