import time
import threading

from concurrent.futures import ThreadPoolExecutor

def work():
    print("Starting work")
    time.sleep(1)
    print("Work complete")

def worker_thread():
    # sleep a little to give the main thread time to exit
    time.sleep(1)

    executor = ThreadPoolExecutor()
    
    future = executor.submit(work)
    

def main():
    thread = threading.Thread(target=worker_thread)
    thread.start()

    # main thread exits now

if __name__ == "__main__":
    main()

Exception in thread Thread-1 (worker_thread):
Traceback (most recent call last):
  File "/usr/lib/python3.14/threading.py", line 1081, in _bootstrap_inner
    self._context.run(self.run)
    ~~~~~~~~~~~~~~~~~^^^^^^^^^^
  File "/usr/lib/python3.14/threading.py", line 1023, in run
    self._target(*self._args, **self._kwargs)
    ~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/*****/*****/implementation/./bug.py", line 18, in worker_thread
    future = executor.submit(work)
  File "/usr/lib/python3.14/concurrent/futures/thread.py", line 207, in submit
    raise RuntimeError('cannot schedule new futures after '
                       'interpreter shutdown')
RuntimeError: cannot schedule new futures after interpreter shutdown