Python - Systems(time, datetime, multiprocessing, random, modul)

Introducing Python
邦訳

開発環境

• macOS Sierra - Apple (OS)
• Emacs (Text Editor)
• Python 3.5 (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 10.1-9.を取り組んでみる。

Things to Do 10.1-9.

コード(Emacs)

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

import datetime

print('10.1')
filename = 'today.txt'
with open(filename, 'w') as f:
    print(datetime.date.today().isoformat(), file=f, end='')

print('10.2')
with open(filename) as f:
    today_string = f.read()

print(today_string)

print('10.3')
today = datetime.datetime.strptime(today_string, '%Y-%m-%d')
print(today)

print('10.4')

import os

print(os.listdir('.'))

print('10.5')
print(os.listdir('..'))

print('10.6')

import multiprocessing
import random
import time


def target(seconds):
    time.sleep(seconds)
    print('Process {0}: {1}'.format(os.getpid(), time.ctime()))

print('start: Process {0}: {1}'.format(os.getpid(), time.ctime()))
for _ in range(10):
    seconds = random.randrange(1, 5)
    p = multiprocessing.Process(target=target, args=(seconds,))
    p.start()

f.close()

print('10.7')

date = datetime.date(2000, 1, 2)

print('10.8')
print(date.isoweekday())

print('10.9')
old = date + datetime.timedelta(days=10000)
print(old.isoformat())

入出力結果(Terminal, IPython)

$ ./sample1.py
10.1
10.2
2016-12-12
10.3
2016-12-12 00:00:00
10.4
['draft.html', 'draft.html~', 'draft1.html', 'draft1.html~', 'draft2.html', 'draft3.html', 'draft4.html', 'draft5.html', 'draft6.html', 'draft7.html', 'draft8.html', 'draft9.html', 'multiprocessing.txt', 'output.txt', 'output.txt~', 'sample1.py', 'sample1.py~', 'sample2.py', 'sample2.py~', 'sample3.py', 'sample3.py~', 'sample4.py', 'sample4.py~', 'sample5.py', 'sample5.py~', 'sample6.py', 'sample6.py~', 'sample7.py', 'sample7.py~', 'sample8.py', 'sample8.py~', 'sample9.py', 'sample9.py~', 'today.txt']
10.5
['.DS_Store', 'ch1', 'ch10', 'ch11', 'ch12', 'ch2', 'ch3', 'ch4', 'ch5', 'ch6', 'ch7', 'ch8', 'ch9', 'introducing-python']
10.6
start: Process 6171: Mon Dec 12 14:23:32 2016
10.7
10.8
7
10.9
2027-05-20
Process 6172: Mon Dec 12 14:23:33 2016
Process 6173: Mon Dec 12 14:23:33 2016
Process 6176: Mon Dec 12 14:23:33 2016
Process 6178: Mon Dec 12 14:23:33 2016
Process 6180: Mon Dec 12 14:23:33 2016
Process 6181: Mon Dec 12 14:23:34 2016
Process 6174: Mon Dec 12 14:23:35 2016
Process 6175: Mon Dec 12 14:23:35 2016
Process 6177: Mon Dec 12 14:23:35 2016
Process 6179: Mon Dec 12 14:23:36 2016
$