[Tutor] how to be sure the process are ended

[jarod_v6 at libero.it]

>----Messaggio originale----
>Da: jarod_v6 at libero.it
>Data: 08/09/2014 18.15
>A: <tutor-request at python.org>
>Ogg: how to be sure the process are ended
>
>Dear all!!
>I want to use subprocess for run some programs But I need to be sure the 
>program end before continue with the other:
>
>subprocess.call("ls")
>							cmd1 = i
>							p1 = subprocess.Popen(cmd1,shell=True,stdout=subprocess.PIPE)
>							
>							while True:
>								if p1.poll() is None:
>									time.sleep(3)
>									
>									pass
>								if p1.poll()==0:
>									print '#'
>									break
>								if p1.poll() is not None and p1.poll() != 0:
>									raise Exception('Error building Alignment using star with hg19 
>database')
>
>
>
>This are not working. How can I do?
>thanks in advance for the precious help
>bw,
>