CODEWITHSUNDEEP
pythonlinuxpython-2.7
learning_prog
learning_prog

Reputation: 23

Run python script only if it's not running

I want to launch a python script from another python script. I know how to do it. But I should launch this script only if it is not running already.

code:

import os
os.system("new_script.py")

But I'm not sure how to check if this script is already running or not.

Upvotes: 2

Views: 4281

Answers (2)

NST
NST

Reputation: 744

Came across this old question looking for solution myself.

Use psutil:

import psutil
import sys
from subprocess import Popen

for process in psutil.process_iter():
    if process.cmdline() == ['python', 'your_script.py']:
        sys.exit('Process found: exiting.')

print('Process not found: starting it.')
Popen(['python', 'your_script.py'])

You can also use start time of the previous process to determine if it's running too long and might be hung:

process.create_time()

There is tons of other useful metadata of the process.

Upvotes: 3

talhasch
talhasch

Reputation: 367

Try this:

import subprocess
import os 

p = subprocess.Popen(['pgrep', '-f', 'your_script.py'], stdout=subprocess.PIPE)
out, err = p.communicate()

if len(out.strip()) == 0:
    os.system("new_script.py")

Upvotes: 7

Related Questions