python 多线程下载 脚本

! python3

multidownloadXkcd.py - Downloads XKCD comics using multiple threads.

import requests, os, bs4, threading os.makedirs('xkcd', exist_ok=True) # store comics in ./xkcd

def downloadXkcd(startComic, endComic): for urlNumber in range(startComic, endComic): # Download the page. print('Downloading page http://xkcd.com/%s...' % (urlNumber)) res = requests.get('http://xkcd.com/%s' % (urlNumber)) res.raise_for_status()

    soup = bs4.BeautifulSoup(res.text)

    # Find the URL of the comic image.
    comicElem = soup.select('#comic img')
    if comicElem == []:
        print('Could not find comic image.')
    else:
        comicUrl = comicElem[0].get('src')
        # Download the image.
        print('Downloading image %s...' % (comicUrl))
        res = requests.get(comicUrl)
        res.raise_for_status()

        # Save the image to ./xkcd
        imageFile = open(os.path.join('xkcd', os.path.basename(comicUrl)), 'wb')
        for chunk in res.iter_content(100000):
            imageFile.write(chunk)
        imageFile.close()

Create and start the Thread objects.

downloadThreads = [] # a list of all the Thread objects for i in range(0, 1400, 100): # loops 14 times, creates 14 threads downloadThread = threading.Thread(target=downloadXkcd, args=(i, i + 99)) downloadThreads.append(downloadThread) downloadThread.start()

Wait for all threads to end.

for downloadThread in downloadThreads: downloadThread.join() print('Done.')