python multiprocess_pool error handling

multiprocess_error_handling.py

#coding:utf-8

import multiprocessing
import traceback
import random
import time
import sys

def random_error_func(x):
    n = random.random()
    time.sleep(0.5)

    if n < 0.1:
        return 1/0  # make exception
    else:
        return x*x

if __name__ == "__main__":
    pool = multiprocessing.Pool(10)
    results = []

    for i in xrange(20):
        r = pool.apply_async(random_error_func, (i,))
        results.append(r)

    for result in results:
        try:
            print result.get()  # sub process error, coming here
        except:
            print traceback.format_exc(sys.exc_info())