A python script that restarts itself (running a new process that reflects any changes on disk)

self_restarting_python_script.py

#!/usr/bin/env python3
# based on https://github.com/cherrypy/cherrypy/blob/0857fa81eb0ab647c7b59a019338bab057f7748b/cherrypy/process/wspbus.py#L305
import sys
import os
import time

_startup_cwd = os.getcwd()

def _do_execv():
    args = sys.argv[:]
    print('Re-spawning %s' % ' '.join(args))
    args.insert(0, sys.executable)
    if sys.platform == 'win32':
        args = ['"%s"' % arg for arg in args]

    os.chdir(_startup_cwd)
    os.execv(sys.executable, args)

if __name__ == '__main__':
    start_time = time.time()
    
    while True:
        td = (time.time() - start_time)
        if td > 5:
            print('_do_execv')
            _do_execv()
            exit(0)
        print(f'{td}')
        time.sleep(1)