[Python] python exe keeps running after calling os.kill and sys.exit(0)

I implemented a web app for visualizing test data to charts. When the app starts to run, it opens a tab in the browser and shows data. I build .exe with parameters --windowed for not having console popup.

Problem :

After starting to run the app in task management there is one tab process and two python exe processes. When i clicked closing the tab, then the tab process terminates, but two python exe keep in the task manager. When i run the app again, then in task management there will be 4 python exe, etc etc.

I tried following, none worked:

Code :

app = Flask(__name__,
template_folder=os.path.join(BASE_DIR, 'templates'),
static_folder=os.path.join(BASE_DIR, 'static'))
app.config['DEBUG'] = False # Enable debug mode for detailed error logs

if __name__ == '__main__':
# Automatically open the browser
webbrowser.open("http://127.0.0.1:5000")
app.run(debug=False, use_reloader=False)


Method A:

def shutdown(): print("Received shutdown request. Stopping application...")
# Get the current process ID
current_pid = os.getpid()

# Run Windows taskkill command to forcefully kill the EXE
subprocess.run(f'taskkill /F /PID {current_pid}', shell=True)

sys.exit(0) # Ensure full exit


Method B:

# Kill the main process
os.kill(os.getpid(), signal.SIGTERM)
sys.exit(0) # Ensure full exit


Method C:

func = request.environ.get("werkzeug.server.shutdown")
if func is None:
raise RuntimeError("Not running with the Werkzeug Server")
func()


Expected:

What I want is that when closing the tab then tab process and two python exe processes are all terminated, the memory is cleared up.

Continue reading...