python中的多进程

from multiprocessing import Pool
def (msg):
    print msg
pool = Pool(4)
jobs = []
for i in range(4):
    jobs.append(pool.apply_async(run_func, (i, )))
pool.close()
pool.join()

from multiprocessing.dummpy import Pool
def (msg):
    print msg
pool = Pool(4)
jobs = []
for i in range(4):
    jobs.append(pool.apply_async(run_func, (i)))
pool.close()
pool.join()