killall tor && service tor start in Python

i want use this command on my Python script :

 killall tor  && service tor start 

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  How can i do it on Python ?
Mehran GoudarziAsked:
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gelonidaCommented:
import subprocess
subprocess.call(["killall", "tor"])
subprocess.call(["service", "tor", "start"])

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or if you want to implement the '&&' as well
import subprocess
returncode = subprocess.call(["killall", "tor"])
if returncode == 0:
    subprocess.call(["service", "tor", "start"])

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Mehran GoudarziAuthor Commented:
what is different between  
subprocess.Popen

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 and
subprocess.call

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gelonidaCommented:
If you use subprocess.Popen, then the process is started, but python does not wait for it to be finished.

The equivalen with subprocess Popen would be.

import subprocess
proc1 = subprocess.Popen(["killall", "tor"])
returncode = proc1.wait()
if returncode == 0:
    proc2 = subprocess.Popen(["service", "tor", "start"])
    returncode = proc2.wait()

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subprodcess.call() is just a shortcut.

if you use subprocess Popen without the wait function, then you might call
"service tor start" before "killall tor" has been finished.
and the python script would continue executing other python commands before any of the subprocesses had been finished.
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