检查Python脚本是否正在运行

Question

I have a python script named update.py, and I want to use another python script to check whether the script is running or not. If update.py doesn't run or error, then the script will run update.py.

Can i do it? If there is an example it will be very thankful.

Answer 1

Scripts are generally used for these kinds of tasks. You have a monitor script that keeps track of update.py that keeps running in the background. It becomes easier if monitor script launches the python script in the beginning.

#!/bin/bash
# Monitor script. 

EXEC=<path>/update.py

while true; do
    "$EXEC" &
    wait # Here the assumption is that you want to run this forever. 
done

Answer 2

Not sure about what you are asking but as given this may help, so if you just want to call one python script from another then you can use script 1

 #!/usr/bin/python 
 from subprocess import call
 call(["python", "update.py"])

Save this file in a script named script1 and run it, it will compile update.py. If you want to check for any syntax error in update.py then you can use script 2

#!/usr/bin/python
from subprocess import call
call(["python","-m","py_compile", "update.py"])

If script2 compiles without any error then it shows that there is no syntax error in your program.

Thirdly if you want to check if update.py is running currently or not you can use script 3

#!/usr/bin/python
import psutil
import sys
from subprocess import Popen

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

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

This last script will tell if your script is running or not and if it is not running it will compile it.