I have a process.py script:

from multiprocessing.connection import Listener

with Listener(('localhost', 6000)) as listener:
    with listener.accept() as connection:
        message = connection.recv()
        # [...]
        connection.send(message)

I launch this script in a thread (to avoid blocking the main thread) with:

import threading, subprocess
threading.Thread(target=lambda: subprocess.run(['python', 'process.py'])).start()

But sometimes I want to wait (block the main thread) until my process has launched.

Here is what I do:

from multiprocessing.connection import Client

nAttempts = 0
while True:
    try:
        with Client(('localhost', 6000)) as connection:
            connection.send(nAttempts)
            message = connection.recv()
            # [...]
            break
    except ConnectionRefusedError:
        nAttempts += 1
        pass

Is there a better approach?

The program tries ~282 connections before being able to connect, can it be a problem?