yet another confusion with multiprocessing error, 'module' object has no attribute 'f'

Question

I know this has been answered before, but it seems that executing the script directly \"python filename.py\" does not work. I have Python 2.6.2 on SuSE Linux.

Code:<

Answer 1

Restructure your code so that the f() function is defined before you create instance of Pool. Otherwise the worker cannot see your function.

#!/usr/bin/python
# -*- coding: utf-8 -*-

from multiprocessing import Pool

def f(x):
    return x*x

p = Pool(1)
p.map(f, [1, 2, 3])