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killall tor  && service tor start  in Python

Posted on 2017-05-08
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Last Modified: 2017-05-08
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 ?
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Question by:Mehran Goudarzi
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Accepted Solution

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gelonida earned 2000 total points
ID: 42124771
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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Author Comment

by:Mehran Goudarzi
ID: 42124869
what is different between  
subprocess.Popen

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 and
subprocess.call

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LVL 17

Expert Comment

by:gelonida
ID: 42125848
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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