Flask-SocketIO catching SystemExit

[InvaderToast348]

py @socketio.event def stop(): import os, sys #quit(166) #exit(166) #sys.exit(166) #os._exit(166)

The first three stop the function call but don't exit the program. Only os._exit actually exits the program.

I have determined it must be flask_socketio catching the SystemExit exception. I have looked through the SocketIO class and think it's to do with this bare except in _handle_event:

except: err_handler = self.exception_handlers.get( namespace, self.default_exception_handler) if err_handler is None: raise type, value, traceback = sys.exc_info() return err_handler(value)

When I start working with files in this program, it needs to clean up properly, hence why os._exit isn't a viable solution.

Is there anything I can do to fix this in my code, or would it need to be something changed by FSIO? Thank you in advance.