In the following example, we implement a target function, namely foo, which displays the digits from 0 to 4 if the child process is in the background; otherwise, it prints the digits from 5 to 9:

1. Let's import the relevant libraries:

import multiprocessing
import time

2. Then, we define the foo() function. As previously specified, the printed digits depend on the value of the name parameter:

def foo():
    name = multiprocessing.current_process().name
    print ("Starting %s 
" %name)
    if name == 'background_process':
        for i in range(0,5):
            print('---> %d 
' %i)
        time.sleep(1)
    else:
        for i in range(5,10):
            print('---> %d 
' %i)
        time.sleep(1)
    print ("Exiting %s 
" %name)

3. Finally, we define the following processes: background_process and NO_background_process. Notice that the daemon parameter is set for the two processes:

if __name__ == '__main__':
    background_process = multiprocessing.Process
                         (name='background_process',
                          target=foo)
    background_process.daemon = True

    NO_background_process = multiprocessing.Process
                            (name='NO_background_process',
                             target=foo)
    
    NO_background_process.daemon = False
    
    background_process.start()
    NO_background_process.start()