about multiprocessing in python3

Question

I use multiprocessing to set up 2 process.
Here is my code:

import multiprocessing 

def aaa():
    while True:
        print('aaa')

def bbb():
    while True:
        print('bbb')


if __name__=='__main__':
    p1=multiprocessing.Process(target=aaa())
    p2=multiprocessing.Process(target=bbb())
    p1.start
    p2.start
    p1.join
    p2.join

I expect it will print:

'aaa','bbb','aaa','bbb','aaa','bbb','aaa','bbb','aaa','bbb','aaa','bbb',

Why does it only print aaa, but not bbb ?
thank you!

`start` and `join` are functions, you need to call them instead of just stating their names: `p1.start()`, note the parentheses. — Hai Vu, Apr 15 '18 at 15:04

score 0 · Answer 1 · answered Apr 15 '18 at 15:01

You're calling aaa, not passing it to Process.

import multiprocessing 

def aaa():
    while True:
        print('aaa')

def bbb():
    while True:
        print('bbb')


if __name__=='__main__':
    p1=multiprocessing.Process(target=aaa)
    p2=multiprocessing.Process(target=bbb)
    p1.start()
    p2.start()
    p1.join()
    p2.join()

about multiprocessing in python3

1 Answers1