How to end the sub process when using subprocess.Popen with python?

Question

I use a script to run two script. the code like this:

import subprocess

subprocess.Popen("python a.py", shell=True)
subprocess.Popen("python b.py", shell=True)

but if I end the main script, the sub process of a.py and b.py are still runing. How to solve it?

added:

the a.py and b.py is two server scripts. When I end the main script using ctrl+c,and the two servers is not end up.So how to end the all process when I end the main script?

Answer 1

By killing the processes.

import subprocess

p1 = subprocess.Popen("python a.py", shell=True)
p2 = subprocess.Popen("python b.py", shell=True)

# ... do things ...

p1.kill()
p2.kill()

You can also automate this with the atexit module:

import subprocess
import atexit

p1 = subprocess.Popen("python a.py", shell=True)
p2 = subprocess.Popen("python b.py", shell=True)
atexit.register(p1.kill)  # register for killing
atexit.register(p2.kill)

# ... do things ...