Probing for open ports works, but gives strange logging message

Dash Python
1

I often run multiple dash applications at once and find it tedious to hardcode open ports so I decided to create a block after the ifmain entry point that probes for open ports starting at 8050. Good news is that it works, but the odd part is that I get two Running on... prompts, where the port on the second prompt is not valid. I’m guessing this has something to do with the hot-reloader, but I didn’t really dive too deep into the source code. Any ideas? Also, if someone has a more refined solution/recipe, please let me know.

Thanks!

Probing for an open port before app.run():

if __name__ == '__main__':
    import socket

    s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    port = 8050
    while True:
        try:
            s.bind(('', port))
            s.close()
            break
        except OSError:
            port += 1
            continue
    app.run_server(debug=debug, port=port)

Logging text (note that 8051 works, and 8052 does not):

Running on http://127.0.0.1:8051/
Debugger PIN: 997-459-730
 * Serving Flask app "app" (lazy loading)
 * Environment: development
 * Debug mode: on
Running on http://127.0.0.1:8052/
Debugger PIN: 221-228-873