How to terminate process from Python using pid?
I wanted to do the same thing as, but I wanted to do it in the one file.
So the logic would be:
- if a script with my name is running, kill it, then exit
- if a script with my name is not running, do stuff
I modified the answer by Bakuriu and came up with this:
from os import getpid
from sys import argv, exit
import psutil ## pip install psutil
myname = argv[0]
mypid = getpid()
for process in psutil.process_iter():
if process.pid != mypid:
for path in process.cmdline():
if myname in path:
print "process found"
process.terminate()
exit()
## your program starts here...
Running the script will do whatever the script does. Running another instance of the script will kill any existing instance of the script.
I use this to display a little PyGTK calendar widget which runs when I click the clock. If I click and the calendar is not up, the calendar displays. If the calendar is running and I click the clock, the calendar disappears.
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.
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.
Note: In previous psutil
versions cmdline
was an attribute instead of a method.