Closes other instances of the same python script when called.

close_other_instances.py

import psutil
import os, inspect

def close_others(file=None):
    if file is None:
        this_path = os.path.abspath(inspect.stack()[-1].filename)
    else:
        this_path = os.path.realpath(file)

    processes = []
    for pid in psutil.pids():
        try:
            process = psutil.Process(pid)
            if process.name() == "python.exe" or process.name() == "pythonw.exe":
                processes.append(process)
        except:
            continue

    for process in processes:
        try:
            if process.pid != os.getpid():
                script_path = os.path.abspath(process.cmdline()[1])
                if script_path == this_path:
                    process.terminate()
        except:
            pass