exit_code_reset.py

import time
from multiprocessing import Process


def target():
    raise Exception('BOOM!')


def main():
    proc = Process(target=target)
    proc.start()
    time.sleep(1)
    print('Is process alive?', proc.is_alive())
    proc._popen.returncode = None  # reset cached exit code
    print('Is process alive?', proc.is_alive())
    

if __name__ == '__main__':
    main()