SSH autokiller for connections from other systems

Question

I was messing around with ssh and decided to write a python program that scans for any connections that aren't from the system, then terminates them. It works well for many connections from my iMac to my MacBook. A more in-depth explanation of the program is written at the top of the code. I'd appreciate feedback on any nitpicks you can find, since I threw this together in about thirty minutes. Any and all feedback is appreciated and considered.

scanner.py

""" Import Statements """
import os
import subprocess
import time

"""

Objective: Scan all connections to this computer, every two seconds, and if any are not
system, as in not `console` or `s000`, find the PID associated with the connection,
then terminate the connection with `kill -9 ...`

"""

def format_pid(text):
    """
    Formats the output to only include PIDS that are not from the system
    """
    ids = text.split("\n")
    all_ids = []
    del ids[0] #removes uptime stuff
    for line in ids:
        pid = line[:13]
        if pid[12:] != '0':
            all_ids.append(pid[:5])
    return all_ids

def get_pids():
    """ Returns all users logged into the computer """
    return format_pid(subprocess.Popen(['ps'], stdout=subprocess.PIPE).communicate()[0])

def kill():
    """ Terminates all processes that are not system """
    processes = get_pids()
    for process in processes:
        if process: # Makes sure process isn't null/empty
            os.system('kill -9 ' + process)
            print("KILLED CONNECTION PROCESS: " + process)

    time.sleep(2)
    kill()


if __name__ == '__main__':
    kill()

Answer 1

Replace magic numbers like 13 there line[:13] with constansts. IMHO:

• rename ids to lines
• all_ids to ids
• processes to pids