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Chapter 15 finished.
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‎15-time/README.md

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# time
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<pre>
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import time
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now = time.time()
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</pre>
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# datetime
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1. import datetime
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2. datetime.datetime.now()
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3. datetime.datetime.fromtimestamp(time.time())
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4. datetime.timedelta()
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‎15-time/about30YearsLater.py

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import datetime
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aboutThirtyYears = datetime.timedelta(days=365*30)
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print(datetime.datetime.now() + aboutThirtyYears)

‎15-time/calcProd.py

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import time
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startTime = time.time()
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# Calculate the product of the first 100,000 numbers.
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product = 1
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for i in range(1, 100000):
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product = product * i
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endTime = time.time()
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print('The result is %s digits long.' % (len(str(product))))
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print('Took %s seconds to calculate.' % (endTime - startTime))

‎15-time/countdown.py

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#! python3
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# countdown.py - A simple countdown script.
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import time, subprocess
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timeLeft = 10
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while timeLeft > 0:
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print(timeLeft, end='')
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time.sleep(1)
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timeLeft = timeLeft - 1
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# At the end of the countdown, play a sound file.
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subprocess.Popen(['start','alarm.wav'], shell=True)

‎15-time/multidownloadXkcd.py

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#! python3
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# multidownloadXkcd.py - Downloads XKCD comics using multiple threads.
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import requests, os, bs4, threading
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os.makedirs('xkcd', exist_ok=True) # store comics in ./xkcd
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def downloadXkcd(startComic, endComic):
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for urlNumber in range(startComic, endComic):
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# Download the page.
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print('Downloading page http://xkcd.com/%s...' % (urlNumber))
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res = requests.get('http://xkcd.com/%s' % (urlNumber))
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res.raise_for_status()
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soup = bs4.BeautifulSoup(res.text)
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# Find the URL of the comic image.
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comicElem = soup.select('#comic img')
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if comicElem == []:
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print('Could not find comic image.')
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else:
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comicUrl = comicElem[0].get('src')
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# Download the image.
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print('Downloading image %s...' % (comicUrl))
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res = requests.get(comicUrl)
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res.raise_for_status()
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# Save the image to ./xkcd
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imageFile = open(os.path.join('xkcd', os.path.basename(comicUrl)), 'wb')
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for chunk in res.iter_content(100000):
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imageFile.write(chunk)
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imageFile.close()
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# Create and start the Thread objects.
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downloadThreads = [] # a list of all the Thread objects
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for i in range(0, 1400, 100): # loops 14 times, creates 14 threads
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downloadThread = threading.Thread(target=downloadXkcd, args=(i, i + 99))
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downloadThreads.append(downloadThread)
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downloadThread.start()
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# Wait for all threads to end.
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for downloadThread in downloadThreads:
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downloadThread.join()
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print('Done.')

‎15-time/stopwatch.py

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#! python3
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# stopwatch.py - A simple stopwatch program.
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import time
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# Display the program's instructions.
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print('Press enter to begin. Afterwards, press ENTER to "click" the stopwatch. Press Ctrl-C to quit.')
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input() # press Enter to begin
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print('Started.')
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startTime = time.time() # get the first lap's start time
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lastTime = startTime
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lapNum = 1
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# Start tracking the lap times.
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try:
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while True:
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input()
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lapTime = round(time.time() - lastTime, 2)
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totalTime = round(time.time() - startTime, 2)
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print('Lap #%s: %s (%s)' % (lapNum, totalTime, lapTime), end='')
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lapNum += 1
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lastTime = time.time() # reset the last lap time
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except KeyboardInterrupt:
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# Handle the Ctrl-C exception to keep its error message from displaying.
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print('\nDone.')

‎15-time/thousandDaysLater.py

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import datetime
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dt = datetime.datetime.now()
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thousandDays = datetime.timedelta(days=1000)
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print(dt + thousandDays)

‎15-time/threadDemo.py

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import threading, time
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print('Start of program.')
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def takeANap():
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time.sleep(5)
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print('Wake up!')
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threadObj = threading.Thread(target=takeANap)
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threadObj.start()
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print('End of program.')

‎15-time/threadWithParameters.py

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import threading
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threadObj = threading.Thread(target=print, args=['Cats', 'Dogs', 'Frogs'],
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kwargs={'sep': ' & '})
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threadObj.start()
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‎15-time/timeSleep.py

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import time
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for i in range(3):
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print('Tick')
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time.sleep(1)
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print('Tock')
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time.sleep(1)
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‎15-time/until.py

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import datetime
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import time
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tm = datetime.datetime(2017, 7, 8, 8, 27, 0)
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while datetime.datetime.now() < tm:
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time.sleep(1)
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print('Done')

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