python how to run process in detached mode

Question

here is a example:

from multiprocessing import Process
import time


def func():
    print(\'sub process is running\')
    time.sleep(5)
    print(\'sub proc         


        

Answer 1

Following the excellent answer from @falsetru, I wrote out a quick generalization in the form of a decorator.

import os
from multiprocessing import Process


def detachify(func):
    """Decorate a function so that its calls are async in a detached process.

    Usage
    -----

    .. code::
            import time

            @detachify
            def f(message):
                time.sleep(5)
                print(message)

            f('Async and detached!!!')

    """
    # create a process fork and run the function
    def forkify(*args, **kwargs):
        if os.fork() != 0:
            return
        func(*args, **kwargs)

    # wrapper to run the forkified function
    def wrapper(*args, **kwargs):
        proc = Process(target=lambda: forkify(*args, **kwargs))
        proc.start()
        proc.join()
        return

    return wrapper

Usage (copied from docstring):

import time

@detachify
def f(message):
    time.sleep(5)
    print(message)

f('Async and detached!!!')

Or if you like,

def f(message):
    time.sleep(5)
    print(message)


detachify(f)('Async and detached!!!')