How to terminate process from Python using pid?

Question

I'm trying to write some short script in python which would start another python code in subprocess if is not already started else terminate terminal & app (Linux).

So it looks like:

#!/usr/bin/python from subprocess import Popen  text_file = open(".proc", "rb") dat = text_file.read() text_file.close()  def do(dat):      text_file = open(".proc", "w")     p = None      if dat == "x" :          p = Popen('python StripCore.py', shell=True)         text_file.write( str( p.pid ) )      else :         text_file.write( "x" )          p = # Assign process by pid / pid from int( dat )         p.terminate()      text_file.close()  do( dat ) 

Have problem of lacking knowledge to name proces by pid which app reads from file ".proc". The other problem is that interpreter says that string named dat is not equal to "x" ??? What I've missed ?

Answer 1

Using the awesome psutil library it's pretty simple:

p = psutil.Process(pid) p.terminate()  #or p.kill() 

If you don't want to install a new library, you can use the os module:

import os import signal  os.kill(pid, signal.SIGTERM) #or signal.SIGKILL  

See also the os.kill documentation.

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If you are interested in starting the command python StripCore.py if it is not running, and killing it otherwise, you can use psutil to do this reliably.

Something like:

import psutil from subprocess import Popen  for process in psutil.process_iter():     if process.cmdline() == ['python', 'StripCore.py']:         print('Process found. Terminating it.')         process.terminate()         break else:     print('Process not found: starting it.')     Popen(['python', 'StripCore.py']) 

Sample run:

$python test_strip.py   #test_strip.py contains the code above Process not found: starting it. $python test_strip.py  Process found. Terminating it. $python test_strip.py  Process not found: starting it. $killall python $python test_strip.py  Process not found: starting it. $python test_strip.py  Process found. Terminating it. $python test_strip.py  Process not found: starting it. 

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Note: In previous psutil versions cmdline was an attribute instead of a method.