进程

import subprocess
subprocess.getoutput('date') # python3 getoutput方法

import multiprocessing
import time
import os

def whoami(name):
    print("I'm %s, in process %s" % (name, os.getpid()))

def loopy(name):
    whoami(name)
    start = 1
    stop = 1000000
    for num in range(start, stop):
        print("	Number %s of %s. Honk!" % (num, stop))
        time.sleep(1)

if __name__ == "__main__":
    whoami("main")
    p = multiprocessing.Process(target=loopy, args=("loopy",))
    p.start()
    time.sleep(5)
    p.terminate()

#输出
'''
I'm main, in process 1528
I'm loopy, in process 1529
    Number 1 of 1000000. Honk!
    Number 2 of 1000000. Honk!
    Number 3 of 1000000. Honk!
    Number 4 of 1000000. Honk!
    Number 5 of 1000000. Honk!'''