Python - Systems(multiprocessing module, Process, time mmodule sleepmethod, random module, randint method)

Introducing Python
Modern Computing in Simple Packages
(O'Reilly Media)
Bill Lubanovic (著)

開発環境

• OS X Yosemite - Apple (OS)
• Emacs (CUI)、BBEdit - Bare Bones Software, Inc. (GUI) (Text Editor)
• Python 3.4 (プログラミング言語)

Introducing Python: Modern Computing in Simple Packages(Bill Lubanovic (著)、 O'Reilly Media)のChapter 10(Systems)、Things to Do 10.6.を解いてみる。

Things to Do 10.6.

コード(Eacs, BBEdit)

#!/usr/bin/env python3
# -*-c doing: utf-8 -*_

import multiprocessing
import time
import random
import os

def f():
    seconds = random.randint(1, 5)
    time.sleep(seconds)
    print(os.getpid(), seconds, time.ctime())
    
for p in [multiprocessing.Process(target=f) for n in range(20)]:
    p.start()
        

入出力結果(Terminal, IPython)

$ ./sample6.py
4530 1 Sat Apr  4 11:09:14 2015
4535 1 Sat Apr  4 11:09:14 2015
4538 1 Sat Apr  4 11:09:14 2015
4539 1 Sat Apr  4 11:09:14 2015
4541 1 Sat Apr  4 11:09:14 2015
4542 1 Sat Apr  4 11:09:14 2015
4543 1 Sat Apr  4 11:09:14 2015
4531 2 Sat Apr  4 11:09:15 2015
4533 2 Sat Apr  4 11:09:15 2015
4546 2 Sat Apr  4 11:09:15 2015
4548 2 Sat Apr  4 11:09:15 2015
4532 3 Sat Apr  4 11:09:16 2015
4534 3 Sat Apr  4 11:09:16 2015
4540 3 Sat Apr  4 11:09:16 2015
4545 3 Sat Apr  4 11:09:16 2015
4529 4 Sat Apr  4 11:09:17 2015
4536 4 Sat Apr  4 11:09:17 2015
4544 4 Sat Apr  4 11:09:17 2015
4547 4 Sat Apr  4 11:09:17 2015
4537 5 Sat Apr  4 11:09:18 2015
$